The ad agencies play an important role in the advertising world and they are ones who help the advertiser in promoting his product and business. The adagency works as a mediator between the advertiser and publisher and this is why they are considered to be important. The experts at the agency understand how an ad campaign works and can help you design your campaign so that your can get good response. So if you have an online business then you need to get good traffic for it and for this you can contact a good adagency. They would help you to get in touch with the publisher and can also help you buy the media space so that you can advertise your website there. The companies can design the ad and also help you understand which type of advertisement is suitable for your website. For instance, if you have a finance website then buying space at finance related website would be more effective in promoting your website. The adagency can also help you to decide which kind of display ad can work best for your website and promote the same. It would help you to get the right traffic at your website and you can promote your company effectively.