The Internet is a worldwide system of interconnected computer networks.
When you connect your computer to the Internet via your Internet Service Provider (ISP), you become part of the ISPs network, which is connected to other networks that make up the Internet.
In Ethiopia our ISP is Ethio Telecom
To connect to the Internet, the following are needed:
a computer
telephone line – for wired and wireless network
modem and/or router
an ISP (Internet Service Provider)
Web browser, e.g., Mozilla Firefox, Google Chrome, MS Edge, Safari, Opera, etc.
Intranet
An intranet is a network that works like the Internet but is only available within a particular organization, not to the public.
An intranet may have web pages used to share company specific data within that company, such as internal telephone numbers or details of employee benefits.
Network
Computer network is a group of two or more computer systems connected together
Computer networks serve a number of purposes:
communications such as email, instant messaging, chat rooms, etc.
shared hardware such as printers and input devices.
shared data and information through the use of shared storage devices.
shared software, which is achieved by running applications on remote computers.
Most computer networks have at least one server.
A server is a powerful computer that provides one or more services to a network and its users, for example, file storage and e-mail.
Types of Network
Local Area Network (LAN)
Metropolitan Area Network (MAN)
Wide Area Network (WAN)
LAN
A LAN covers a small area such as one site or building, e.g., a school or a university campus.
It is a privately owned computer network covering a small Networks geographical area, like a home, office, or groups of buildings
MAN
MAN is larger than a local area network
It covers the area of a single city.
MANs rarely extend beyond 100 KM
Comprise a combination of different hardware and transmission media
WAN
WAN covers a large geographical area
Most WANs are made from several LANs connected together