For common use as a pointer device, the dragging motion of a finger is translated into a finer, relative motion of the cursor on the output to the display on the operating system, analogous to the handling of a mouse that is lifted and put back on a surface. While touchpads, like touchscreens, are able to sense absolute position, resolution is limited by their size.
Fingers insulated by a glove may also be problematic, and capacitive touchpads was rarely used for medical hardware input.
Capacitance-based touchpads will not sense the tip of a pencil or other similar ungrounded or non-conducting implements. The most common technology used in the 2010s senses the change of capacitance where a finger touches the pad. Touchpads operate in one of several ways, including capacitive sensing or resistive touchscreen.
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