A passphrase is a phrase that is easy for you to remember but modified with a combination of upper- and lower-case letters, numbers and special characters. For example, the phrase “I like sailing on the sea” can be modified to create the passphrase ilikeSa!ling3onthesea.
Passphrases are much easier to remember than a random string of characters. And because passphrases tend to be longer, they are also harder for hackers to crack. Experts recommend putting upper-case letters, numbers and symbols in the middle of the password—not at the beginning or the end. You can also add spaces to your passphrase.