Capitalization

Capitalization (American English) or capitalisation (Commonwealth English) is the practice of writing a word with its first letter as a capital letter (uppercase letter) and the remaining letters in lower case, in writing systems with a case distinction. The term also may refer to the use of uppercase letters in general, or the choice between uppercase and lowercase.

The rules of capitalization vary between conventional writing systems (orthographies) and over time. The systematic use of capitalized and uncapitalized words in running text is called mixed case. There are various names for different capitalization rules, including sentence case and title case.