What is the difference between a deck, a proposal, and a proof of performance report in sponsorship?

A deck is colorful marketing material (PDF flyer or video) used to get a sponsor's attention and secure an initial meeting. A proposal is a simple business plan created after you understand the company's goals, outlining what you will deliver and what you expect in return. A proof of performance report is documentation showing what you accomplished for the sponsor throughout the partnership, used to secure renewals and as a case study for new sponsors. The key is keeping these three documents separate and using each at the appropriate stage of the relationship.