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First-party data is data that is collected by a company from its own sources, such as website visits, app usage, and customer transactions. Second-party data is data that is collected by one company and shared with another company, typically as part of a strategic partnership or commercial agreement. Third-party data is data that is collected by a company from external sources, such as market research firms, data aggregators, and other companies. In general, first-party data is considered the most valuable because it is the most relevant and specific to the company that is collecting it. Second- and third-party data can also be useful, but they may be less specific and relevant to the company using them.DM