At the lowest programming level, executable code consists of machine language instructions supported by an individual processor—typically a central processing unit (CPU) or a graphics processing unit (GPU).
For example, an instruction may change the value stored in a particular storage location in the computer—an effect that is not directly observable to the user.
The processor executes the instructions in the order they are provided, unless it is instructed to “jump” to a different instruction, or is interrupted by the operating system.
As of 2015, most personal computers, smartphone devices, and servers have processors with multiple execution units or multiple processors performing computation together, and computing has become a much more concurrent activity than in the past.
Because they are more similar to normal languages than machine languages, they are easier and more efficient for programmers to use.
A compiler, interpreter, or a mix of the two is used to transform high-level languages into machine language.
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