A Password is a secret code or key issued to the computer to be able to identify you and grant you access.
Keeping away unwanted access to your computer and its files is always a critical requirement for maintaining a safe computer.
Unfortunately, many people own computers but very few take seriously the issue of password maintenance practices.
A password is like a key to your apartment. If you go out of your home without locking the door, be sure any illegal person with the intention of invading your residence will do that effortlessly and without resistance.