Does the <li> tag in HTML have an ending tag?

Question

So, I was learning about lists in HTML at college and the professor said <li> doesn't have an ending tag </li> along with some other tags like <img> and <br>. Is that correct or not? Because I've seen a lot of templates / themes using

Answer 1

The li element has an end tag (</li>), but it’s optional in some cases:

An li element's end tag may be omitted if the li element is immediately followed by another li element or if there is no more content in the parent element.