Tapping

To furnish with taps.

"If we tap the maple trees, we can get maple syrup!"

To draw off liquid from a vessel.

"He tapped a new barrel of beer."

To deplete, especially of a liquid via a tap; to tap out.

To exploit.

"Businesses are trying to tap the youth market."

To strike lightly.

"She tapped him on the shoulder to get his attention."

To touch one's finger, foot, or other body parts on a surface (usually) repeatedly.

"He was so nervous he began to tap his fingers on the table."

To make a sharp noise.

"The tree, swaying in the breeze, began to tap on the window pane."

To operate an electronic device (e.g. a mobile phone) by tapping a specific place on its (capacitive or other) touch screen.

An act of making a light hit or strike against something.

A guitar technique in which the strings are tapped against the fingerboard

The process by which a resource is tapped or exploited.