Computers use ones and zeros to process but our world is analog; there are no specific units in a gorgeous sunset, in the sound of a singer, in the movement of a child on a swing.
In order to get sound or images or positional data into a computer, some form of analog to digital conversion is needed. Digital to Analog conversion is needed to get a stored print out to your printer or screen.
One of the premier companies for analog semiconductors started in a basement in Cambridge, Massachusetts over forty years ago. I'm talking about Analog Devices.
As they offer a huge scope of products, their website is deep and wide. I just stumbled on this branch and if you do any work with electronics at all, you need to visit here: Analog Dialog Potpourri
Lots of links for Do It Yourself high fidelity audio, Digital Signal Processing, reference sheets for their major product lines (lots!), books, product manuals, application notes, patents by ADI employees, Rarely Asked Questions including "Strange but true stories from the call logs of Analog Devices" Lots of great stuff!
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