HTML is made up of a variety of elements, also known as "tags". Most elements follow this format:
Notice how there is both an opening and closing part of the tag. The closing tag includes a forward slash at the beginning.
A simple example:
<p>This is a paragraph.</p>
Some HTML elements (like img and br) don't have their own content. These are known as self closing tags or empty tags. They look like this:
A simple example:
<br />The br tag inserts a line break (not a paragraph break). This tag has no content, so it is self closing.