Single digits refer to the numbers from 0 to 9. These numbers are the basic building blocks of mathematics and are used in everyday counting and calculations. Each single digit represents a unique value and can be combined to form larger numbers. In mathematics, single digits are often used in various operations such as addition, subtraction, multiplication, and division. They are also essential in understanding concepts like place value, where the position of a digit in a number determines its value. Single digits play a crucial role in number systems, including the decimal system, which is widely used around the world.