An HTML form is a key element in web development that allows users to submit data to a server. It is created using the <form> tag, which can include various input fields like <input> for text, <textarea> for larger text areas, <select> for dropdowns, <radio> buttons, and checkboxes. Forms also use buttons like <button> or <input type=”submit”> to process user input. Attributes like action specify the server endpoint, while method determines whether the data is sent using GET or POST. Forms are essential for tasks like signing up, logging in, or searching, enabling interaction between users and web applications.