The advent of Web 2.0 and the rise of social networking sites and other web services has compelled most of us to create dozens of new accounts – each requiring a username and a password.
While the easier option would be to maintain a single username and password for all your online accounts, it is not advisable from a security point of view. Lack of strong passwords makes it easy for hackers to break into your accounts. Hence it is better to have a unique and strong password for every online account