A “tactile switch” is one type of widely used switch that completes an electrical circuit typically when pressure is applied to the device by the user, which then gives the user a perceptible “click” or haptic bump in response, indicating current flow. Current flow is turned off when the switch is released. To give a shorter definition, a tactile switch is a momentary action device whose operation is perceptible by touch. This tangible feedback gives some assurance to the user that the switch has operated and a signal has flowed. Tactile switch models are also available that turn off current when the switch is pushed and turn it back on when released.

Voltage Rating: (sometimes called rated power) indicates the maximum voltage that the switch can withstand when open or when closed. Voltage ratings on tactile switches are typically low.
Current Rating: the maximum current in amps that a switch can carry before damage.
Activation Force: (also called operating force) the amount of force or pressure (expressed in gram force or gf) that is needed to move an actuator on a switch.
Deflection: (also called actuator travel) the overall travel distance of a depressed switch.
Contact Force: the amount of force or pressure (expressed in grams) required for the switch to connect the terminals and cause power to flow.
Actuator Height: the height of the actuator above the body of the switch.
Lifecycle Range: the expected duration of a switch under normal operating conditions.
Temperature Range: the range of temperatures within which the switch will operate to specifications.
Mounting Style: the method used to mount the switch on the PCB, either through hole or surface mount.
IP Rating: an international standard that classifies the degrees of protection of a switch (or other product) against the intrusion of dust and liquids.