The document discusses keyword research, which involves identifying popular search terms to help determine what people search for online and how to best market websites and products. It covers the main types of keywords, the importance of keyword research for driving traffic and promoting products or services, the process of researching keywords which includes searching, categorizing, analyzing search volume, relevancy, competition and trends, and selecting keywords. Finally, it lists some common tools for conducting keyword research, such as Google Keyword Planner, Google Search, and Google Trends.