For bookings:
Non-profit: This option is for individuals, groups, or organizations that are not seeking a profit (collecting some donations, material costs, etc. is fine).
For profit: This option is for individuals, groups, or organizations wherein a profit is made for services (e.g., through collecting participation fees, class fees, etc).
Commercial: This option is for individuals, groups, or organizations that are operating as a business wherein either management staff or employees working for or contracted for a business offer a service.