assume responsibility for or leadership of; "The senator announced that he would sponsor the health care plan"

a COMPANY who will be ADVERTISING at your Wedding or Event

an individual or business that pays for the monthly website cost for the opportunity to advertise on your website

Depending on the context, a sponsor simply means an advertiser who has sponsored an ad and, by doing so, has also helped sponsor or sustain the Web site itself. It can also mean an advertiser that has a special relationship with the Web site and supports a special feature of a Web site, such as a writer's column, a Flower-of-the-Day, or a collection of articles on a particular subject.

An individual or business establishment that financially supports a race driver, team, race or series of races in return for advertising and marketing benefits.

To make some money webmasters can place adverts on their sites. Each time you click on these adverts or banners they get paid a few cents for bringing potential customers to the sponsors website.

A Web site offering an affiliate/advertising program which pays webmasters to display advertisements on their sites.

A wealthy individual or corporation that finances a race, race team, or racing series. Usually corporate sponsors finance racing ventures as part of their advertising campaigns. A sponsor will have their logos on the cars, team uniforms, and team equipment haulers. They will also use their involvement in racing for television and print advertising.

One who advertises on an email list. A sponsorship sometimes differs from an ad, in that a sponsorship can be an exclusive arrangement with a top-of-list position.

Cost-effective type of advertising on the Web, usually featuring a small banner ad below the fold linked to another site.

If you advertise a home business program and someone joins (becomes an affiliate), you are their sponsor. As their sponsor, you will earn override commissions on their sales and you are therefore responsible for providing leadership and support, helping them with questions they have, etc.