When some folks say "swim," they picture a specific stroke (often a stroke like one used in racing Freestyle). Unfortunately, that muddies the issues.
When I say "swim," I mean any human movement that produces a traveling effect in the water (without using the sides of a pool or the bottom of the pool, lake, etc., and without--of course--a boat or other device.)
A specific human movement or set of movements is more precisely called a "stroke."
Therefore, an individual can "swim" without knowing or using a "stroke." And, an individual who uses a "stroke" is likely to swim--that is, to travel in the water.
Discussions of safety and of learning will be more precise when these terms form a foundation of understanding.
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