Decimal numbers, or numbers of base 10, are the numbers that we use normally day to day. In a decimal number, each decimal place has a single digit that can go from 0 to 9 (that is, 10 possible values). We count from 0 to 1, 2, 3, 4, 5, 6, 7, 8, 9, and then we add a decimal place to the left: 10.
Numbers of different bases, like base 2 (binary), and base 16 (hexadecimal), have a different quantity of possible digits, such that 10 in binary equals 2 in decimal, and 10 in hexadecimal equals 16. See the articles about binary numbers and hexadecimal numbers for details.
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