Form and input tag in HTML

Question

We can use input tag outside of form tag and it works. Why we should use form tag?

Answer 1

Accessibility. Form tags gives keyboard accessibility. When we write input tags inside a form it is accessible from "tab" button on keyboard.

Answer 2

If we put an element out of the form, then value of the said element will not be included in form data when the form is submitted.

Answer 3

Form tags helps you post all the input fields that are inside the form tags to a database or an API.