What are the descriptions of the 5 basic swimming strokes?

Maybe add " allowed in competition sanctioned swimming" to limit the 4 strokes. In the IM the last must be "crawl= freestyle" Actually it doesn't have to be crawl.It just has to be a different stroke than the first 3(not fly,BK or BR.) It could be flutterbutter(fly with flutter kick) or sidestroke,etc.

Maybe add " allowed in competition sanctioned swimming" to limit the 4 strokes. In the IM the last must be "crawl= freestyle" Actually it doesn't have to be crawl.It just has to be a different stroke than the first 3(not fly,BK or BR.) It could be flutterbutter(fly with flutter kick) or sidestroke,etc.