This is called positional notation: the numerical value represented by a number is not only related to the size of the number, but also to the right of the position of the number.

Each digit (0 or 1) in a binary number represents a numerical value equal to the digit (0 or 1) multiplied by the bit weight of the digit. The bit weight is an integer power based on 2, which increases bit by bit: the bit weight of the lowest bit of a binary integer is 2 0, and the bit weight of the second lowest bit is 21,thus increasing bit by bit to the high bit. Of course, the bit weight of binary decimal system is a negative integer power that decreases from the decimal point to the right (to the lower position): 2 (- 1) 2 (-2) 2 (-3). .....