Keyword research is as old as SEO itself. Search engines use keywords to provide a list of relevant results to the searcher, and as this SEO market expanded, Google brought in an advertising platform that gave businesses a chance to appear on search engine results pages for keywords.
From there, Google offered a tool that enabled businesses to see how many searches occurred for any keyword, eventually giving way to keyword research. This tool is indispensable for business because it came from Google itself and offers additional insights to gain leverage over the competition.
As businesses began using more data for marketing, however, it showed that keywords are useful, but may not always be completely accurate. More software tools emerged to provide additional keyword insights, giving marketers more opportunities than ever to use keywords to their advantage.