Undertone is an advertising platform that was established on 2002. Undertone is a platform of digital advertising that provides the users online advertising display and video advertising services that let the bloggers and businesses to target advertisements to specific locations, keywords, and demographics. Undertone content marketing system is based on visitor’s behaviors, tags, keywords and content of the website or blog. The other best thing about Undertone is that it never cross its limits. It has a clear money refund policy in case if it do the work outside the agreed-upon portfolio of the website. Undertone is one of the best advertisings solutions for both advertisers and publishers. Publishers can get the real income from their content and advertisers can get access to the real audience to increase the power of their ads. By this way, Undertone lets the both advertisers and publishers to fulfill their requirements.