**Definition:**
An HTML form is a section of a web page that allows users to enter data, which can then be sent to a server for processing. Forms are essential for gathering user input in web applications.

**Key ideas:**
- Forms use various input types like text boxes, radio buttons, and checkboxes.
- The `<form>` tag is used to create a form in HTML.
- Each input element within the form has a `name` attribute to identify the data.
- Forms can include buttons to submit the data to a server.

**Why this topic matters in this category:**
Understanding HTML forms is crucial for creating interactive and user-friendly web applications.