Affiliate marketing is a performance-based marketing strategy where a business rewards affiliates for each customer brought about by the affiliate's own marketing efforts. The affiliates typically promote the business’ products or services using a unique affiliate link, and receive a commission for every sale made as a result.

There are various affiliate marketing services available that help businesses establish and manage their affiliate programs, including:

1. Commission Junction: A popular affiliate marketing network that connects businesses with affiliates.
2. Rakuten Marketing: An affiliate marketing platform that offers a wide range of tools and services for businesses to create and manage their affiliate programs.
3. ShareASale: A platform that allows businesses to set up an affiliate program and manage their affiliates, as well as providing tracking and reporting tools for affiliates.
4. Amazon Associates: Amazon's affiliate program, which allows affiliates to earn a commission for promoting and selling products on Amazon.
5. ClickBank: A platform that specializes in digital products and allows businesses to set up and manage an affiliate program.

These services typically offer a range of tools and services to help businesses create, manage, and grow their affiliate programs, including reporting and tracking tools, affiliate management tools, and payment processing services.