Along with a username, you might need a password. A password is a string of letters and numbers that lets you access a computer system, network or online account. It’s important that your password is kept confidential. You shouldn’t tell just anyone what your password is. Sometimes, a trusted adult--like a parent, guardian or teacher--may need to know your password. They might need to help you remember it or to make sure you’re using the internet safely. In that case, it’s OK to share. When coming up with a password, make sure no one can guess it. But don’t make it too complicated to remember either. A secure password contains capital and lowercase letters and numbers. It can also include symbols. Sometimes, symbols are used in place of letters that they look similar to, like an exclamation point in place of the letter "i." Some people like to think of a secret sentence about a favorite character, book or movie. Then, they can use that sentence to create their password. For example, the password BtFcL2e!c might stand for the sentence “Biggie the Flocabulary cat loves to eat ice cream.”
Which detail from the passage best explains why someone might need to know your password?