In contrast, content sites commonly charge a fixed price per click rather than use a bidding system. PPC display advertisements, also known as banner ads, are shown on web sites with related content that have agreed to show ads and are typically not pay-per-click advertising.
A service-level agreement (SLA) is a contract between a service provider and its internal or external customers that documents what services the provider will furnish.
A service agreement is an agreement between two persons or businesses where one agrees to provide a specified service to the other. It can also be an express undertaking of employment signed by both the employer and the employee detailing therein the explicit terms and conditions of service.