In the digital era, fooling a computer is a little easier than your bank teller. Since your passwords are so valuable, theyre highly targeted by hackers and malware. There are several password cracking programs in existence that use several techniques to brute-force weak passwords. Change your password regularly, but changing it constantly isnt going to help you much if its constantly trying to keep it safe. This has been considered a security security best practice, in theory, because in theory in your password will be harder to guess.”]
Source: https://blog.malwarebytes.com/101/2013/04/too-tough-to-crack/