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Runtime
In computer science, runtime refers to the duration of a program's execution, from beginning to end. (Compare compile-time.)
Some programming functions can only be executed (or are more efficient or accurate) when performed at runtime; for this reason, some programming bugs are not discovered until the program is tested in a "live" environment, despite sophisticated compile-time debugging. Languages with type checking occurring at runtime are called "dynamically typed".
Java Virtual Machine is an example of such a program: it interprets portable binary Java programs (bytecode) at runtime.
See also: compiler, compile-time, binding, interpreter, runtime engine[?]
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