The switching action happens between the leads spaced at the shortest distance. One aspect is that the switch has four leads but only two wires are actually being switched (if you check the schematic symbol). The are a couple of confusing things to consider in using momentary switches. The symbol for S2 is more descriptive of a breadboard-mounted momentary switch but the basic idea is exactly the same, a connection is being created by pushing the switch. The schematic symbols for switches can vary somewhat. This wiki entry focuses on momentary switches but it is important to note that many other types of switches, such as toggle switches or slide switches, can be wired in exactly the same manner and used as digital sensors, with the same code examples as used below. Nevertheless, a switch can always be used as a digital sensor, transmitting one bit of information, which is whether the switch state is Off or On (which can also be defined as 0 & 1). We don’t often think about switches as sensors, chiefly because they are older technology, with which we are completely familiar. In many cases nowadays however, switches are digital sensors, meaning that instead of directly controlling a high-powered device, they are controlling a logic (low power) signal to a microcontroller (eg Arduino), telling the microcontroller which state a user prefers, High or LOW, On or Off, 1 or 0 (they all amount to the same thing). An example of this is the switch on the wall in your living room. They directly control the flow of electricity to an appliance, flashlight or mains-voltage lamp.
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