Brainstorming is a group creativity technique where people work together to generate ideas and find solutions to problems. There are different brainstorming techniques including nominal, group passing, team idea mapping, guided, and individual brainstorming. Brainstorming can help spark creativity and new ideas, but it can also be time consuming and arguments may arise. To improve a brainstorming session, facilitators should avoid rushing, give everyone attention, and use both individual and group approaches.