What is Empty HTML element?
When HTML element does not have any content.Than those element are called as Empty element.Empty element does not have any end tag.
Example:
<br /> (It is an empty element which is used to break line.)
Because it is an empty element than their is no need to close them.
To use empty element is only on HTML.Because in XHTML,XML and new versions of HTML does have provided this types of element.