A keyword can be defined as the words, groups of words, or phrases that determine (depending on the matching rules) whether an ad will be displayed when a user does a query (search) in a search engine. There are two different types of keywords. Such as  Short-tail keyword: Generic keywords known as "short tail" don't provide much context or specifics. They usually relate to a product or category and are composed of one or two words. For example, "Red chair", "android mobile", and "washing machine".  Long-tail keyword: Long Tail Keywords, on the other hand, are longer and more specialized, usually consisting of more than three words. For example, "Red color chair for office", "Android mobile below 6.3" display", and" Samsung front load washing machine".