I find remembering passwords the hardest thing in life. When creating user accounts on the net, we often need the username and password. To save trouble, a lot of people use the same username and password in alot of places – including bank accounts!
Not every website uses encryption for password, so if you happen to register yourself in a hacker’s website, the hacker might use your username and password to try and login to other websites. Account Registration is always necessary but remember to keep a few low security user id and passwords for untrusted site. Some comon sense stuff but people don’t practice it.