# Overview of forms, comments, and visits

Forms are mechanism that you use to gather study data. You use forms to enter, correct, or update data for a subject visit. For more information, see Case report forms.

Comments are blocks of text in which you can enter any pertinent additional details about a form item. On the Comment page you can create, update, or view a comment on an individual form data item or on the entire form.

- Form-level comments apply to an entire form.
- Item-level comments apply to items within a form.

A visit is a subject evaluation checkpoint when you collect data.

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