Can someone give me a detailed explanation about frame rate and fps concepts?
Answer
"Frame rate" and "FPS" (frames per second) are usually the same thing. A "frame" is usually a single image in the series of images presented to your screen rapidly so as to give the illusion of motion in your game, and so the terms generally refer to how many of those images your game can simulate and produce within one second.
FPS is often used as a crude measurement of performance, but it's important to remember that it's a non-linear measurement: the difference between 30 and 60 FPS is much larger than 60 and 90 FPS.
Occasionally you will see the term applied in a context where "frame" doesn't refer directly to a unit of graphics/simulation processing overall, but to something narrower in scope. The idea is the same, though: how many of these steps does the program produce within one second.
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