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SDL is a widely-used-on-Linux platform abstraction layer. A lot of games have targeted it to make themselves more portable and provide some basic functionality.
If you’ve been on Linux for some years, you’ve probably run into it. I’d guess that most Windows users probably wouldn’t know what it is, though.
I’ve been using Linux since about 2011, but I’m blind, so I have very little need for video games, which may explain why I have not run into it, or at least not to my knowledge. The only Linux games I can remember playing are Open Arena and SuperTux Card LOL.