There are two types of capitalization, title capitalization and sentence style capitalization.
This Is an Example of Title Capitalization
This is an example of sentence capitalization
Title capitalization is when every word in a sentence, statement, phrase, or label are capitalized except for certain words. Capitalize all words except for:
Use title capitalization in the following cases:
Sentence style capitalization is when the first letter of the sentence, statement, phrase, or label is capitalized and all other words are lower case. The only exception to this is proper nouns which are always capitalized.
Use sentence style capitalization in the following cases: