Keeping that information flowing without interruption or error means keeping that data organized. Engineers build elaborate data structures to do that, digital formats to house those 1s and 0s. As I've said before, these digital formats are key to understanding cellular radio, including PCS systems. And understanding digital formats means understanding bits, frames, slots, and channels. Bits get put into frames.
Frames hold slots which in turn hold channels.
All these elements act together. We have a railroad made not of steel but bits. The data stream is managed and built out of bits. Frames and slots and channels are all made out of bits, just assembled in different ways. Frames are like railroad cars, they carry and hold the slots which contains the channels which carry and manage the bits.