[QUESTION] What's the purpose of the MSAA option?

[JohnSmith2007]

What does it change? What does it do?

[Inventor211]

MSAA is a type of antialiasing intended to smooth out jagged/pixelated edges of diagonal graphics in the program. AA will work more or less aggressively (and create a differing performance hit) depending on what level you set it at. A quick google search can give you more information