Source: MarketingTerms.com
Barter - to exchange goods or services directly without the use of money.
Banner Exchange - network where participating sites display banner ads in exchange for credits which are converted (using a predetermined exchange rate) into ads to be displayed on other sites.
Button Eexchange - network where participating sites display button ads in exchange for credits which are converted (using a predetermined exchange rate) into ads to be displayed on other sites.
Text Link Exchange - network where participating sites display text ads in exchange for credits which are converted (using a predetermined exchange rate) into ads to be displayed on other sites.
Web Ring - a means for navigating a group of related sites primarily by going forward and backward.
Website Award - an award given from one Web site to another Web site.