Sponsorship is the financial support for a sport (whether this is an event, organisation or performer) by an outside body (be it a person or organisation) for the mutual benefit of both parties.
Sponsorship occurs at all levels of sport. School teams may have sponsored kit while elite athletes may be paid large sums of money to wear certain sportswear or use branded equipment. Sponsorship can be financial or in-kind payments. Sponsorship means both parties receive benefits from the agreement.