Swapping
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Works best with many small partitions
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Allows many programs to use memory simultaneously
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Allows each program in turn to use the memory
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Does not work with overlaying
Swapping is a memory management technique where the entire process is moved between main memory and secondary storage (disk). Processes take turns using memory - when one process is swapped out to disk, another can be swapped in and use that memory space. It doesn't work with many small partitions (that's paging), doesn't allow simultaneous use (processes alternate), and can actually complement overlaying by extending its principles.
Swapping is an OS memory-management technique where entire processes are moved between main memory and disk (swap space) so that more processes than would physically fit in RAM can each get a turn running — a process is swapped in, runs for a while, then may be swapped out to let another process use that memory. It doesn't inherently favor small partitions, doesn't let multiple programs use the same memory simultaneously (that's the opposite of what swapping does — it's about time-sharing memory, not concurrent sharing), and it works fine alongside overlaying (a different technique for fitting a single large program into limited memory). "Allows each program in turn to use the memory" correctly captures this time-multiplexed sharing.