What is meant b networking?

                                It means connecting different computers and other equipment into a network, so that they can share data and resources. 
                          

The generic term "network" refers to a group of entities (objects, people, etc.) which are connected to one another. A network, therefore, allows material or immaterial elements to be circulated among all of these entities, based on well-defined rules.

• network: A group of computers and peripheral devices connected to each other. Note that the smallest possible network is two computers connected together.
• networking: Implementing tools and tasks for linking computers so that they can share resources over the network.

Depending on what kind of entity is involved, the term used will differ:

• transportation network: A combination of infrastructure and vehicles used for transporting people and goods between different geographic areas.
• telephone network: Infrastructure for transporting voice signals from one telephone station to another.
• neural network: A group of brain cells connected to each other
• criminal network: A group of con artists in cahoots (wherever there's one con artist, there's usually another!)
• computer network: A group of computers linked to each other with physical lines, exchanging information as digital data (binary values, i.e. values encoded as a signal which may represent either 0 or 1)

The articles you're now reading, obviously, deal with computer networks.

There isn't just one kind of network, as there have historically been different kinds of computers, which communicate using various different languages. The need for multiple types of networks also arises from the heterogeneity of the physical transmission media that link them together, whether that means the data is transferred the same way (such as by electrical pulses, light beams, or electromagnetic waves) or uses the same kind of physical medium (such as coaxial cable, twisted pairs, or fibre-optic lines).

Each chapter describes the characteristics of physical transmission media, as well as the way data travels over the network.