One of the hard parts of being an entrepreneur is the psychological weight of being the key decision-maker. Every decision and metric depends on you. Figuring out how to organize your time, stay accountable, and make everything happen without losing your mind is a real challenge. I don’t say this lightly: Not having people to talk to and bounce ideas around with can be one of the hardest parts of starting your own business. For that reason, many entrepreneurs I know turn to mastermind accountability groups to help them stay focused and successful. But what exactly is a mastermind and why are they so important? Here’s what they are, how they’re structured, and how it works.