Causal contact

Causal contact is when two people or things touch each other or come in contact with each other in some way. For example, if you handshake with someone, you are making causal contact. If you ride on a bus, you are making causal contact with the bus and the other people on the bus. It's like a chain, where one person or thing can cause something to happen to another person or thing just by touching it or getting close to it.