HTML entities are strigns inside HTML code that start with ampersand & and end with semicolon ;. They allow you to add wide variety of characters to your HTML code.

For example < and > characters are reserved in HTML because they are used to enclose HTML tags. But if you need to display one of them on the page you can use > to display > and < for <.

HTML entities can be referenced by name, like we did with > and &lt, but they also have numeric references: hexadecimal and decimal.

For examle > can also be referenced as > and < can be referenced as <.

Some of the entities don’t have named reference and can only be referenced by their decimal or hexadecimal reference. Like for example celsius sign ℃

Here is a list of some popular HTML entities: