An Online Advertising Agreement is a legal contract that establishes the terms and conditions for the placement and use of advertisements online. This agreement outlines the responsibilities of both the advertiser and the publisher in regard to the advertisement, including payment structures, the placement of the advertisement, and other relevant details. There are several types of Online Advertising Agreements, such as Cost Per Click (CPC) Agreements, Cost Per A Thousand Impressions (CPM) Agreements, Cost Per Action (CPA) Agreements, and Cost Per Lead (CPL) Agreements. Each type of agreement outlines the payment structure, as well as any other details relevant to the advertisement.