Registration fees:
When you add a participant to an event, you can enter registration fees that must be paid before the participant can attend the event. For example, your Organization is holding a CPR class this summer. Each student in the class must pay £75 to cover the cost of books and instruction. When you add a participant for the CPR class, you can enter the registration fees due for the class on the Registration Fees tab of the participant record.

Other donations:
Other donations are gifts made to an event, other than registration fees, by anyone in your database. For example, Jennifer Kennick decides to donate £1,000 to your annual auction. She is not participating in or attending your event. She just believes in your cause and wants to donate money.