Advertising agencies are most commonly used by small or large companies to advertise their products and services. The arrival of the Internet and the World Wide Web powered new specialized advertising services; Internet advertising agencies. Internet advertising agencies specialize in Internet and Web advertising.

The first companies over ten years ago were merely a submission services where URLs were submitted for the clients to multiple search engines and link pages, but that has changed. Internet advertising is a field requiring a lot of knowledge and experience and some of it is pure science.