There are four types of brainstorming: individual, round-robin, nominal group, and electronic.
Individual brainstorming is when one person comes up with ideas on their own. This can be helpful when you need to come up with a quick solution or when you're having trouble getting started.
Round-robin brainstorming is when a group takes turns coming up with ideas. This can help to stimulate creative thinking and prevent people from getting stuck.
Nominal group brainstorming is when a group comes up with ideas and then votes on the best ones. This can help to ensure that the best ideas are heard and that the group comes to a consensus.
Electronic brainstorming is when people come up with ideas electronically, either through email, instant messaging, or a dedicated brainstorming website. This can be helpful when people are not able to meet in person or when you want to capture ideas quickly.