HTML entities are special codes used to display characters that are reserved for HTML syntax, or characters that are not available on a standard keyboard. They are represented by an ampersand '&' followed by a keyword or number, and then a semicolon ';'. For example, '&lt;' is used to display the less than symbol '<', and " " is used to display a non-breaking space.
Here's an example of how to use HTML entities to display the degree symbol:
In this example, the "&deg;" entity is used to display the degree symbol. When the code is rendered in a web browser, the degree symbol will be displayed instead of the "&deg;" entity.