sentence: Some websites allow only the use of letters and numbers, but no other characters on the keyboard.
sentences_before: Modern passwords are made of characters, letters and numbers. Sometimes a password will require a minimum number of characters. Usually this is from six to eight.
sentences_after: Websites also advise changing a password once a year or more often to prevent hacking. A person may be able to guess a password if it is too easy.
concept_name: website
headings: Password
categories: Computer security