Billboards and street advertising in Shinjuku, Tokyo, Japan, (2005)
Generally speaking, advertising is the promotion of goods, services, companies and ideas, usually by an identified sponsor. Marketers see advertising as part of an overall promotional strategy. Other components of the promotional mix include publicity, public relations, personal selling and sales promotion.
Online advertising is advertising on the Internet. This particular form of advertising is a source of revenue for an increasing number of websites and companies.
There are two sides to online advertising, a legitimate one and an illegitimate one. The legitimate side of online advertising includes search engine advertising, advertising networks and opt-in e-mail advertising. The illegitimate side is dominated by spamming.
Though the range of advertising options has expanded since in the commercialization of the Internet, the use of rich media and static images is extremely popular. The ever-increasing audience of online users will likely continue to be a major advertising market.