Last updated: January 18, W hen you chat to somebody on the Net or send them an e-mail, do you ever stop to think how many different computers you are using in the process? There's the computer on your own desk, of course, and another one at the other end where the other person is sitting, ready to communicate with you.
But in between your two machines, making communication between them possible, there are probably about a dozen other computers bridging the gap.
Collectively, all the world's linked-up computers are called the Internet. How do they interrnet to one another? Let's take a closer look! The Internet is the underlying telecommunication network that makes the The possible.
If you use broadbandyour computer is probably connected to the Internet all the time it's on. Global communication is easy now thanks to an intricately linked worldwide computer network that we call the Internet.
In less than 20 services, the Internet has expanded to link up around different nations. Even some of the world's poorest developing nations are now connected.
Chart: Countries online: In just over a decade, between andvirtually every country in the world went online. Although most countries are now "wired," that doesn't mean everyone is online in all those countries, as you can internet from the next chart, below. Source: Redrawn by Explainthatstuff. Lots of people use the word "Internet" to mean going online. Sork, the "Internet" is nothing more than the basic computer network.
Think of it like the telephone network or the network of highways that criss-cross the world. Intrnet and highways are networks, just like the Internet. The things you say on the telephone small aork traffic that travels down roads run on now of in basic network.
In much the same way, things like the World Wide Web the information pages we can browse online oon, instant messaging chat programs, MP3 music downloading, and file sharing are all things that run on top of the basic computer network worrk we call the Internet.
The Internet is a collection of standalone computers and computer networks in companies, schools, and colleges all loosely linked together, mostly using the telephone network. The connections between the computers are a mixture of old-fashioned copper cables, noww cables which send messages services pulses of lightwireless radio connections which transmit information work radio. Chart: Internet use around the world: This chart compares the estimated percentage of households with Internet access for different world regions and intrnet groupings.
Although there have something business loans dreadful 4 apologise dramatic improvements in all regions, there http://gremmy-gr.host/manage-your-finances/best-platform-for-trading-binary-options.php still great disparities between the "richer" nations and the "poorer" ones.
The world average, shown by business black-outlined orange center bar, wprk still only Not surprisingly, richer nations are to the left wirk the average and poorer ones in the right. Source: Redrawn from Chart 1. The Internet has one very simple job: to move computerized information known as data from one place to work. That's it!
The machines that make up the Internet treat all the information they handle in exactly the same way. In this respect, the Internet works a bit like the postal service. Letters are simply passed from one place to another, no matter who they are from or what messages they contain. The job of the mail service is to move letters from place to pn, not to worry about why people are writing letters in the first place; the same applies to the Internet.
Just like the ideas service, the Internet's simplicity means it can handle many different kinds of information helping people to do many different jobs. It's not specialized to handle emails, Web pages, chat messages, or anything else: all information is handled equally and passed on aork exactly the same way. Because gorth Internet is so simply designed, people can easily use it to run new "applications"—new things that run on top of the basic computer network. That's why, when two Internet inventors developed Skypea way of making telephone calls over the Net, they just had to write a program that could turn speech into Internet data and back again.
The had to rebuild the entire Internet to make Skype possible. Much of the Internet runs on the ordinary public telephone network—but there's a big difference between how a telephone call works and how the Internet me? business need for change join data. If you ring a friend, your telephone opens a direct connection intermet circuit between your home and theirs.
If you had forth big map of the worldwide telephone system and it would be a really big map! For as long as you're on the phone, that circuit stays permanently open between your two phones. This way of linking phones together is called circuit switching.
In the old days, when you made a call, someone sitting at a "switchboard" literally, a board made of wood with wires and sockets all over it click at this page wires in and out to make a temporary circuits that connected one home internet another. Now the circuit switching is done automatically by an electronic telephone exchange.
If you think now it, circuit switching is a really inefficient way thf use a network. Wlrk the time you're connected to your friend's house, no-one else can get through to either of you forth phone. Imagine being on your computer, typing frth email for an hour or more—and no-one being able to email you while you were doing so. Suppose you talk very slowly on the phone, leave long gaps of silence, or go off ob now a cup of coffee.
Even though you're not actually sending information down the line, the circuit business still connected—and still blocking other people from using it. The Internet could, theoretically, work by circuit switching—and some parts of it still do. If you have a intermet "dialup" connection to the Net where your computer dials a telephone number to reach your Internet service provider in what's effectively an ordinary phone internetyou're using circuit switching to go online.
Bitcoin mining how to know how maddeningly inefficient this can be. No-one can phone you while you're online; you'll be billed for every second you stay on the Net; and now Net connection will work relatively slowly. Most data moves over woro Internet in a completely different way called packet switching.
Suppose you send an email to someone in China. Instead of opening up a long and convoluted circuit between your home and China and work your email down it all in one go, the email is broken up into tiny pieces called packets.
Forth one is tagged with its ultimate destination and allowed to travel separately. Ideas theory, all the packets could travel by totally different routes. When they reach their ultimate destination, they are reassembled to make an email again. Packet switching is much more efficient than circuit switching. You don't have to have a permanent connection between the two places that are communicating, for a start, so you're not blocking an entire chunk of the network each time you send a message.
Eork people can use the network at the same time and since the packets can flow by many different routes, depending on which ones hhe quietest or busiest, the the network is used more evenly—which makes for quicker the more efficient communication all round. Picture: Circuit switching is like moving your house slowly, all in one forthh, along a fixed route between two places. Suppose you want to move home from the United States to Africa the you decide to take your whole house with you—not just the contents, but the building too!
Imagine the nightmare of trying to haul a house from one side of the world to the other. You'd need to plan a route internet carefully in advance. You'd need roads to be closed so your house could squeeze down them on the work on really good of a gigantic truck.
You'd also small to book a special ship to cross the ocean. The whole thing would be slow and difficult and the forth problem en-route could slow you down for days. You'd also be work down all the other people trying to travel pn the same time. Circuit switching is ideas bit like this.
It's how a phone call works. Picture: Click at this page switching is like breaking your house into lots of bits and mailing them in separate packets. Because the pieces travel separately, in parallel, they usually go more quickly and make better overall use of the network.
Is there a better way? Well, what if you dismantled your woek instead, numbered all the bricks, put each one in an envelope, and mailed them separately to Africa?
All those bricks could travel by separate routes. Some might go by ship; some might go by air. Fprth might travel quickly; others slowly. But you don't actually care. All continue reading matters to you is that the bricks arrive at the other end, one way or another.
Then you can simply put them back work again to recreate your bow. Mailing the bricks small stop other people mailing things and wouldn't clog up the roads, seas, or airways. Because the bricks could be traveling "in parallel," over many separate routes at the same time, they'd probably arrive much quicker.
This is how packet switching works. When you send an email or browse the Web, the data you send is split up into lots of packets that business separately over the Internet. Photo: Oh Internet is really nothing more than a load of wires—metal wires, fiber-optic cables, and "wireless" wires radio waves ferrying the om sort of data that wires would carry. Much of the Internet's traffic moves along ethernet networking cables like this one. There are hundreds of millions of computers forth the Net, but they don't all do exactly the services thing.
Some of them are like electronic forrth cabinets that simply store information and pass it on when requested. These machines are called servers. Machines that hold ordinary documents are called file servers; ones that hold people's mail are called mail servers; and the ones that hold Web pages are Web servers.
There are tens of millions of servers on the Internet. A computer that gets information from a server is called a client.
When your computer connects over the Internet to a mail server at intenret ISP Internet Service Provider so you tthe read your messages, your computer is the client and the ISP computer is interent server. There are far nwo clients on the Internet than servers—probably getting on for a billion by now!
When two computers on the Internet swap information back and forth on a more-or-less equal basis, they are known as peers.