Source : Free On-Line Dictionary of Computing

Best Fit
     
         A {resource} allocation scheme (usually for
        {memory}).  Best Fit tries to determine the best place to put
        the new data.  The definition of 'best' may differ between
        implementations, but one example might be to try and minimise
        the wasted space at the end of the block being allocated -
        i.e. use the smallest space which is big enough.
     
        By minimising wasted space, more data can be allocated
        overall, at the expense of a more time-consuming allocation
        {routine}.
     
        Compare {First Fit}.
     
        (1997-06-02)