Through-hole tact switches are small push-button switches designed with leads that pass through holes on a printed circuit board (PCB) and are soldered on the opposite side.

They are commonly used in electronic devices, DIY projects, and prototyping, where a sturdy, reliable connection is needed. Like other tact switches, they provide momentary contact and tactile feedback when pressed.

In simple terms, a through-hole tact switch is a tiny button with pins that go through the PCB, completing a circuit only while you press it.