They impact our lives in myriad ways, sometimes visibly, sometimes not. They also raise many social and personal issues worth considering. Now it is possible to communicate with people whose faces you've never seen. These relationships may be based on shared interests or hobbies or focus on games that you both like to play.
Some people even prefer to communicate by computer rather than in-person.
They allow for easier, faster and cheaper collaboration among colleagues who live in different places. When information was published by a relatively small number of known publishers, it was fairly easy to enforce copyright laws. Sure, people sometimes photocopied a few pages for their friends, but they were not able to give away hundreds of copies without incurring large expense. But with the ease of publishing electronically, particularly on the Internet, it is much easier to copy other people's work and even claim it as your own. Computers have brought wondrous new worlds of information into people's lives.