Nope. I'm talking about A/D conversion. When converting from analog to digital, samples are 'faked' and interpolated into the sample stream. Like
This says.
Also, look at
this. This is an oversampling ADC and uses an interpolation filter to accomplish what I've described. The math can get complicated, but they show some nice graphics that gives you the idea.
One important concept in oversampling is the nyquest frequency still determines the maximum frequency that gets processed. That's why CD's are still limited to about 22KHZ or so.