The Markets Research subject lists the procedures and instruments for related commercial research in the decisions to be taken in the field of marketing. Its content aims to gain an overview of the market research process, and aims to publicize the usefulness of marketing research, its context and the limits of its use. The main research techniques used will be presented: what they consist of, when they have to be used, and also their advantages and disadvantages compared to the other techniques. The subject will be carried out from a user perspective of the investigation, that is, how to use the research in each situation to make the best operational and strategic marketing decisions.