Give some examples (applications) for the using of the network in our daily life?

Every thing we use from over computer is network example any application you run from your system its use network protocols . For Example your outlook express when you open it and use it ( its use network portocols to fetch the mail from mail server , or connect from mail server).
Second example is Online Gamming
third example is Any application that use your lan network or internet network is example of your network :)

Peace Hope this will help