Marketing research involves systematically gathering and analyzing data to help companies make better marketing decisions. It includes both secondary research of existing data and primary research collecting new data. The marketing research process involves 4 steps - defining the problem, developing a research plan, implementing the plan by collecting data, and reporting findings. This can involve surveys, experiments, observations and focus groups. Researchers must develop sampling plans and instruments to efficiently obtain relevant information from consumers and the market. The goal is to provide accurate insights to help companies understand customers and make informed choices.