A password is a secret word, phrase, or string of characters that proves you are who you say you are. When you log into your email, start a video game, or unlock a phone, you enter a password that only you should know. Think of it like a key that exists in your memory instead of your pocket.

Passwords protect your private information from people who shouldn't see it. A strong password uses a mix of letters, numbers, and symbols that would be hard for someone else to guess. “Password123” or “abc123” are terrible passwords because they're too obvious. “Tr0pic@lFr0g!2024” is much better because it's random and complex.

In the old days, passwords were literal: soldiers used secret words to identify friends from enemies. If you approached a military camp at night, a guard might challenge you with a question, and you'd need to respond with the correct password to prove you belonged there. A soldier who forgot the password might not be allowed back into their own camp.

Today we use dozens of passwords for different accounts and devices. The challenge is remembering them all while keeping each one unique and secure. Many people use password managers, special programs that safely store all their passwords so they only need to remember one master password. People are often told not to share their passwords with others, and to change them if they think someone else might know them.