The SPST (single-pole, single-throw) Switch is a switch with a single input and a single output. The input and output are either connected or disconnected. This can be used to switch on and off any part of your circuit, much like the light switches work in your house!
The SPST (single-pole, single-throw) Switch has a single input and a single output; the input and output are either connected or not connected. Flipping the switch causes it to change between the two states, allowing you to control the connection to a specific part of your circuit. Though our version of this switch acts like an SPST, the module actually contains a DPDT package that is wired to do so, utilizing one input pin and one output pin.