What feature in Access is primarily used for data manipulation?

Forms are specifically designed to facilitate data manipulation within Access. They provide a user-friendly interface for users to enter, modify, and delete records in a database. By utilizing forms, users can interact with the underlying data in a structured manner, which often includes features like validation rules, drop-down lists, and buttons for various actions, ultimately making data management more intuitive.

While tables store the actual data and are essential for organizing it, forms are what users interact with to perform operations on that data. Reports, on the other hand, are tailored for presenting data rather than manipulating it. Relationships define how different tables interact with each other but do not directly enable data manipulation. Therefore, forms stand out as the primary feature for this purpose in Access.