Base 10, also known as the decimal system, is a numeral system that uses ten digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. Each digit's position in a number represents a power of ten, making it easy to understand and use for counting and calculations. For example, in the number 345, the digit 3 represents three hundreds, the digit 4 represents four tens, and the digit 5 represents five units. This system is widely used in everyday life, from basic arithmetic to complex mathematics. Base 10 is the foundation for many other concepts, such as place value and decimal fractions. Its simplicity and efficiency make it the most common numeral system in the world.