TLDR

Officially, any number in the decimal number system can be called a decimal. When most people say decimal, however, they are talking about numbers that come after the decimal point - like 0.123 or 0.5678. These decimals can refer to small amounts or small parts of a whole. Understanding decimals and how to work with them is very important!

TLDR

The decimal number system, also called base-10, is the standard Decimals are