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The void HTML   element represents a line break, shifting the text or objects included after it to a new line. Multiple  elements will cause multiple line breaks. To set a block of text apart as a paragraph, use.

Global attributes
See Global HTML Attributes.

The global attribute  combined with the CSS   property allows the following content to be cleared from the left, right, or from both.

Example:

This is really useful when there is an element before the break which causes the break to happen on the right side of that element. Clearing to the left allows the content to be cleared below said element, not beside it.

Usage
HTML example:

Rendering
User agents start the text flow on a new line when they come across the element.

Typical CSS representation
The element is one of the very few that does not typically have a CSS representation.