On or Off. Zero or One. Discontinuous and discrete, as opposed to analog which is continuous. Analog's changes and differences are typically small, gradual, and adjacent. Larger bytes with more bits per byte can contain more information of greater resolution.
Digital communication depend on bandwidth and compression .
Think volume per second. Thus one of digital's challenges is the battle between resolution and throughput. And the squeeze is on, literally and figuratively. Too high a traffic volume creates a rush hour bottleneck both on I-75 and the Internet. The task is to get more people into smaller vehicles, or to find alternative transportation modes.