The Internet is a worldwide system of unified computer networks for the storage and transmission of information. First, you should understand what a computer network is. It is a set of computers and various devices that exchange information without any intermediate media (floppy disks, CDs, flash cards, etc.). In simple terms, a computer network is two or more computers connected by a special cable. If you combine computers from all over the world, you get a worldwide computer network. This is not yet the Internet, because it lacks a very important element – a universal environment in which these computers could communicate. Standards (data transfer protocols) were created for this communication. All this set: computers, wires and data protocols and there is a favorite Internet. In order for us to use it, we need to organize it all into one large, orderly structure. It has already been created and is called the World Wide Web (WWW), which translates as the world wide web. This system provides access to linked documents on various computers connected to a worldwide computer network. Let's imagine this very web of wires and computers. Brrr, it turns out some kind of tangle, which together is what we commonly call the Internet. Theoretically, millions of computers are connected to your home computer. To make everything work, there are Internet providers that provide access to the Internet. Also, the provider takes over the management and maintenance of the computer network of your company, home, district, city, country. Internet service providers (ISPS), there are several levels: * First level ISP (Intercontinental operator) provides access for continents and countries. There are only 11 of them on the whole planet. * Second level ISP (regional operator) provides access for regions, regions, etc · * Third-level ISP (local operator) provides access for cities, districts, counties. The hierarchy of network access is something like this: 1. An Intercontinental operator that owns access. 2. The national operator buys the Internet from No. 1 and connects directly to the backbone of the Intercontinental provider. 3. The regional operator buys the Internet from No. 2. 4. The local operator buys access from No. 3. Immediately I'll make a reservation, that clauses 1 and 2 are super expensive. Options 3 and 4 can be a good choice for small companies. In order to connect the future network with a higher-level ISP, it is necessary to purchase equipment and find a room for it. Equipment a lot, that's basic: web server, mail server, FTP server, ID and terminal server, secondary server, the router, protection against unauthorized hacking of the system, network switches, rack equipment, cables, tools and test equipment, remote access server, uninterruptible power supplies, cabinets, racks, spare parts, etc.