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A two-way lighting switch typically has 4 terminals: two terminals for the switched circuit and two terminals for the incoming power supply.
You can tell if a switch is a 3-way switch by looking at how many terminals it has. A 3-way switch will have three terminals, including a common terminal and two traveler terminals. It is designed to control a light fixture from two separate locations.
A 3-way light switch has two hot terminals. One hot terminal is connected to the power source, and the other hot terminal is connected to either the light fixture or another 3-way switch in the circuit.
A one-way lighting switch typically has two terminals - one for the incoming live wire and one for the outgoing live wire that provides power to the light fixture.
An intermediate switch layout involves two switches controlling a single light fixture. One switch is typically located at each end of a corridor or staircase, allowing the light to be turned on or off from either location. This layout requires a three-core and earth cable to connect the switches and the light fixture.