The default method of keyword-matching in PPC campaigns, broad match displays your ad with relevant keywords, even if they aren’t exactly the keywords you targeted. So if your ad targets “kids’ bicycl [..]

A keyword matching method in which an ad is matched with searches that are similar to the specified keywords (Source)

The default matching option, broad match means that your ad may show if a search term contains your keyword terms in any order, and possibly along with other terms. Your ads can also show for singular [..]

A paid search option where a keyword is paired or matched to a search query when the query uses the keywords, in any order and possibly with the addition of other words.