Field types refer to the different categories of data that can be stored in a database or a form. Common field types include text, number, date, and boolean. Each type serves a specific purpose, allowing users to input and manage data effectively. For example, a text field is used for names or descriptions, while a number field is suitable for quantities or measurements. Choosing the correct field type is essential for data integrity and usability. Using the appropriate field type ensures that the data entered is valid and can be processed correctly. For instance, a date field restricts input to valid dates, preventing errors in data entry and analysis.