It makes one of two connections. A spdt is a bit more sophisticated.

Automotive Toggle Switches
Spst toggle switch wiring diagram. Shown can be a 6 for white c for red or x for blue. The other terminal is for the output. This wiring diagram applies to several switches with the only difference being the color of the lights. Variety of spdt toggle switch wiring diagram. An example circuit of a spst toggle switch is shown below. Pin 2 is where the accessory that the switch is going to turn on is connected.
1 terminal is for the input. A wiring diagram is a streamlined standard photographic depiction of an electrical circuit. Spst toggle switches function as simple on off switches. The switch is always making one of the two connections and flips between them. The diagram below represents the schematic diagram for a spst rocker switch. Spdt toggle switch single position dual throw xx.
Perhaps the most common rocker switch on the planet the v1d1 b60b is a spst standard on off rocker switch. Terminal 2 is connected to power. It shows the elements of the circuit as simplified forms and also the power and also signal links between the tools. When closed current can flow and power the load. Below is the wiring schematic diagram for connecting a spst toggle switch. Terminal 1 is connected to one load or accessory terminal 3 is connected to another load or accessory.
Here is a diagram of a spdt toggle switch. Terminal 1 is connected to one load or accessory terminal 3 is connected to another load or accessory. Here is an example of how a spst might be wired to power a light. When open they disconnect the circuit so that current cannot flow to the load. You can see that a spst toggle switch only has 2 terminals. Here is a diagram of a spdt toggle switch.
Pin 1 is where the rocker switch receives the input power. Pin 3 is where the switch is either connected to ground or left open.