First-party data is data that a company collects about its own customers. This data is gathered through direct interactions with customers, such as online surveys, customer service interactions, and transaction data. First-party data is usually more accurate and reliable than other types of data because it comes directly from the source.
Third-party data is data that a company collects from sources outside of its direct interactions with customers. This data is typically collected from public sources, such as social media, demographic data, and market research. Third-party data can be helpful in complementing first-party data, but it is important to note that it is not always as reliable due to its indirect nature.