Group discussion is a methodology used by organizations to evaluate candidates' personality traits and skills. In a group discussion, candidates are given a topic and have 15-20 minutes to discuss it among themselves. There are two categories of group discussions - organizational discussions to solve problems, and discussions as part of a selection process to assess candidates. Successful group discussion requires skills like communication, reasoning, leadership, and flexibility as well as the ability to join a discussion, support others' views, make points strongly, and refocus discussions.