Group communication involves interaction between 3-20 people to exchange messages and potentially influence each other. It has components like interdependence on each other, being context-specific, dynamic over time as members learn, needing shared goals and norms, and providing feedback. Types of group communication include verbal discussion, technology-driven collaboration, non-verbal cues, in-person interaction, and virtual meetings. Group discussions aim to arrive at a conclusion through members' participation on a planned topic, and have advantages like diverse perspectives but also challenges like uneven participation.