Just In Time (JIT) Compilation

JIT compilation is a technique in which some of the program is
compiled at run time, as opposed to in advance of being run (often on
another machine). JIT compilation offers the advantage that specific
system information can be made use of to enhance the performance of
the program in the environment in which it is being run - information
that could not be known in advance, particularly when compiling on
another computer. The initial time needed to do such inline compiling
is usually offset by the speed gains obtained afterwards.

One well known language whose platform takes advantage of JIT
compilation is Java.

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