Advertising is the vital thread that connects a company with its constituents. Businesses have so many and so varied advertising needs that companies have cropped up to cater to the very specific needs of each industry. The following list is designed to be a resource for people looking for help for their advertising campaigns. It contains companies that offer advertising services for a wide range of companies as well as resources that can help you find more information on the topic. Please feel free to add any other websites here that you think belong on this list.