Runtime (program lifecycle phase) - Wikipedia
https://en.wikipedia.org/wiki/Runtime_(program_lifecycle_phase)
In computer science, runtime, run time, or execution time is the final phase of a computer program's life cycle, in which the code is being executed on the computer's central processing unit (CPU) as machine code. In other words, "runtime" is the running phase of a program. A runtime error is detected after or during the execution (running state) of a program, whereas a compile-time error is detected by the compiler before the program is ever executed. Type checking, register …
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