"What is a network? How networks work"

  A network is a group of two or more  computer systems linked together. There are many types of computer networks, including the following:

local-area networks (LANs): The computers are geographically close together (that is, in the same building).

wide-area networks(WANs): The computers are farther apart and are connected by telephone lines or radio waves.

campus-area networks (CANs): The computers are within a limited geographic area, such as a campus or military base.

metropolitan-area networks (MANs): A data network designed for a town or city.

home-area networks (HANs): A network contained within a user's home that connects a person's digital devices.

    According to the needs, there are three main types of network topology.They are bus topology, star topology and ring topology.

      

   Bus topology -In communications technology, you think of a bus as a common “highway” on which data is transmitted.A bus refers to the main physical pathway or central cable where all other devices are connected to it. Like a major motor highway, all traffic flow will be affected if this main “road” is broken.

  Ring topology- A ring topology consists of all computers another devices that are connected in a loop. Ring topology is also known as a ring network. A ring network can be found in Local Area Networks. In a ring network each node directly connect to two neighboring nodes.A server may exist in a ring network, but it will not connect to all the nodes in the network.

   Star topology- In the early days of computer networking, all computers were connected to a centraIised mainframe computer. All resources and management of information were center in this main computer.The idea of a centralised mainframe computer is where the basic concept of a star topology comes from. A star topology consists of a central host which acts as the center, and all nodes connect to the host. A star topology is also known as star network.

Networking is a matter of creating useful linkages, both within and among communities, organizations, and societies, in order to mobilize resources and achieve various goals.

     Networking occurs at a variety of levels. At the level of neighborhoods and communities, it is a matter of creating reciprocal relationships with other members of society. In many instances, parties meet informally to share a meal or hold a casual meeting. 
    They often share resources, contacts, and information with one another. As a result of these conversations and newly found connections, individuals often find jobs and freelance work, locate apartments, trade services, and develop cooperative strategies.