Internet is the network of networks. It uses TCP or IP Protocol. ADVANTAGES-Internet has made it possible to do a lot of things. Through internet one can communicate with persons living far away, E-commerce, it helps to gather abundant information regarding any topic, easy sharing, entertainment. DISADVANTAGES-spam mails, mallicious programs like virus or Trojans or worms etc. can be sent from one system to another or can come from websites, addiction to internet.