Using ADC with resistive touchscreens

What is an ADC?
ADC stands for analog-to-digital converter. It is an electronic device that converts input analog voltage to a discrete digital number. Applications include anything that involves the processing of analog signals into digital form.

What does LCD stand for?
A display technology that uses rod-shaped molecules (that flow like liquid and bend light. Unenergized, the crystals direct light through two polarizing filters, showing a natural background color. When energized, the crystals redirect the light to be absorbed in one of the polarizers, causing the dark appearance of crossed polarizers to show. The contrast and viewing angle improve as the molecules are twisted further.