Online Advertising may be in any form. A banner ad campaigns campaign, a classified ad, a social network ad, a PPC ad, email marketing etc. all these are categorized under web marketing. Banner advertising is even so the most commonly adopted means of online promotion among brand owners and advertisers. https://canvas.instructure.com/eportfolios/3073046/Home/Online_Advertising__A_Profitable_Means_of_Promotion_