What is keyword matching?

Keyword match types are parameters that can be set on your keywords to control which searches trigger your ads to appear. There are 4 different keyword match types in AdWords: Broad Match, Broad Match Modifier, Phrase Match, and Exact Match.

For More Information Please Refer: https://blog.tryadhawk.com/google-adwords/game-set-match-types-the-lowdown-on-adwords-keyword-matching-options/