What is LastPass and why you should use it
As they say, the only secure password is the one you can't remember. This is the idea that keeps password managers like LastPass going. With LastPass, you only need a one super-strong master password (there goes the name—"the last pass you'll ever need"), which can be a line from your favourite song translated to a different language you speak, a quote from a movie, or any other phrase that is not too easy to hack.
Once you've entered the master password, LastPass will let you access your credentials for every other account saved in LastPass (Facebook and Twitter logins, e-mail, etc.) or do the autologin (If you activated it. Don't do it.). This way, you can use strong generated passwords for your accounts, without having to remember them or writing them down.
The great thing about LastPass is that it stores your data encrypted online and the data is only decrypted locally in your browser with your key, which even LastPass itself does not have. This way, LastPass users are protected from hacker attacks like the ones that happened to Adobe or Apple users.