What is brainstorming?

[Accurate]

Brain storming is a common way to generate ideas, Brainstorming can be done more formally or without any restrictions. Either way the basic idea is generating multiple ideas around several topics. A formal brainstorming session has a leader who ask participants to share their ideas around certain topics. One person shares his/her ideas first and then the next one continues in that format. Many times brainstorming sessions are not lead in a formal way, but groups of people can sit down and write down their ideas concerning the specific topic.
Either way, the brain storming session is held, it is important to obey the rules among which is that not criticism is allowed.