What does "interaction" mean?

Native speaker’s answer
Rebecca
An interaction is an exchange (communication or contact) between two parties. For example, if your sister greets you in the morning, that's an interaction. A conversation with a coworker is also an interaction. It's always an action(s) that causes a reaction. Ex: I don't interact with my classmates much as we don't get along. Ex: I have a lot of interactions with my deskmate because we sit next to each other.