<br /> Breaking Space
This tag puts a line break in the flow of text on the page.
Because it does not need to describe or enclose any text, we do not need to write separate opening and closing tags, which might look like this: <br></br>.
Instead, the tag can be written so that it is self-closing. That is, it opens and closes all within one tag. It looks like this:
The <br part of the tag opens the element. The /> then closes it. There is a single space between the <br and the />.
<hr /> Horizontal Rule
This puts a horizontal line on the page. Like the <br /> tag, this tag is also self-closing because it does not need to describe or enclose any text.