html5 - What is the relationship between form and input tags in Html?

Question

In Html, what is the relationship between form and input tags?
Is there any affiliation between the two? I have seen that in many cases input is placed in the form and used . It is rarely used alone. What is the relationship between the two? Please give us a detailed introduction.

Answer 1

Use it in

form就是表单，既然是表单，那么里面自然可以包含input,即输入控件。
当然一个form里一个input也没有（例如只有select和textarea的表单）也是完全合法的。
input不一定要包含在form, but it will be more troublesome to submit when used alone (ajax and other technologies must be used).

Answer 2

Put input in form

Answer 3

Contains relationships, and there are input tags in the form.