Using a single password for multiple sites may be a convenient practice, but it is not a safe one. Most IT security experts recommend using a different password for each online account to prevent hackers from gaining access to all your accounts, should they compromise one set of your credentials.
Experts recommend the use of password-management programs to securely track passwords. These programs encrypt and store passwords for all the sites you visit and in some cases can also enter sites’ passwords for you. The password management software protects multiple passwords behind a single master password, reducing the number of unique passwords you need to remember to one. Make sure that your master password is a strong one and follows good security practices.
For more information about choosing strong passwords and using password-management tools, see the U.S. Computer Emergency Readiness Team’s (US-CERT) publication Password Security, Protection, and Management.