As I describe the number of terminals, I am not counting the ground terminal (usually colored green.) A four-way switch has four terminals. Two are for two "travelers" coming in, and two are for "travelers" going out. One pair is at the top, and one pair is at the bottom. You only need to use a four-way switch if you are wiring three or more switches together to control the same light. In the case of three switches, only the middle one needs to be a four-way, with the first and third switches only needing to be three way switches. If you are only wiring two switches together, you only need to use three-way switches. However, you can use a four-way switch in place of a three-way switch by only using 3 of it's 4 terminals. . . Before I write the rest of a very long reply, please ask me some more questions so that I can focus on what you need to know. Please describe what you are doing.
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