Computers are connected with networks.
Server: Software that provides services to a client, or the hardware that is running it.
Client: Software or hardware that requests services from a server.
Advantages
They allow data to be shared very easily. Everyday activities such as bookings, ordering things and making phone calls would be much slower without networks. In many organisations, colleagues have to work together and the ability to share data is vital to that so networks are also very important to the workplace.
Disadvantages
Building and keeping a network running needs a lot of experts so it can be expensive for some companies. A team of analysts and technicians are vital for a good network.
Networks can be accessed by unauthorised people which may want to steal data so strong passwords are needed which must also must be changed often. Some websites and software should be blocked because viruses can be downloaded which will enter networks and steal information.