Group discussions are used in the selection process for MBA programs to evaluate candidates. They involve forming groups of 8-10 candidates and giving them a topic or case to analyze and discuss within a time limit. Employers evaluate candidates on their knowledge, communication skills, group behavior, and leadership potential. Good communication skills include active listening, clarity of expression, appropriate body language, and fluency. Effective group behavior demonstrates the ability to interact well with others, remain objective, and act as a good team player. Leadership skills involve both functional abilities like knowledge and coordination abilities. Proper body language and participation, as well as avoiding domination or silence, are important to succeed in a group discussion.