Extreme newbie question - what does frame drops mean

I keep seeing people talk about frames dropping. Does this mean that as your captureing some frames just disappear (causing out of sync sound and video?). LMK
thanks

[aldus4]

Well they don't actually disappear as they were never created.

For example if you are using PAL to capture a video feed it should capture 25 frames per second. Now if it only captures 24 per second, you've lost or as video techies say, dropped a frame. The more frames you drop the more choppy the video feed would become, as your player would still play 25 frames per second.

OK?