Some ISP's offer their customers the ability to Interactive Advertising Agencies . Interactive ad agencies are a subsegment of traditional advertising agencies. Interactive ad agencies specialize in buying, creating, designing, and placing interactive ads for their clients. Publishers encompass firms who are engaged in providing information on individual web sites. Much of the content on the internet is free.
Publishers generate money by charging advertising on their individual web sites.
This is usually what keeps publishers providing more content. However, many publishers are losing money because of their sole reliance on advertising for revenue.