HTML - Forms - W3Schools.com

Forms are common in daily life for signing up or joining programs. In modern web development, these forms are built with HTML. An HTML form is used to collect user input and send it to a server for processing. The `<form>` HTML element acts as a container for various form elements.

The `<input>` element is one of the most frequently used elements within a form, with its display varying based on its 'type' attribute. Examples include text fields for short text like names (`<input type="text">`), radio buttons for single selections (`<input type="radio">`), and checkboxes for multiple selections (`<input type="checkbox">`). There are many other input types available.

Beyond the `<input>` element, other important form elements include the `<select>` element, which creates a dropdown list for various options, and the `<textarea>` element, designed for multi-line text input, similar to comment fields.

To finalize a form and send the user's input, a submit button is necessary, created with `<input type="submit">`. When clicked, the user's input is sent to a file on a server for processing. For more in-depth knowledge on forms, w3schools.com is recommended.