Definitions
A digit is one of the characters used in any positional numbering system to represent all numbers starting at 0 and ending at one less than the base of the numbering system. In the decimal system, there are ten digits, 0–9, and in the hexadecimal system there are sixteen digits, 0–9 and a–f.
A binary number system is one that uses only two digits, 0 and 1.
A hexadecimal number system is one that uses sixteen digits, 0–9 and a–f.
CPU is an abbreviation for central processing unit. This is the "active" part of your computer, which executes all the machine instructions that make the computer do useful work.
A machine instruction is one of the fundamental operations that a CPU can perform. Some examples of these operations are addition, ...
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