The promotion of a website through other traditional forms of advertising such as magazines, newspapers, radio, television, billboards, etc.
The idea of cross promotion is to assist in informing users or those interested in your business through various forms of advertising. In regards to a website this can be displayed on various advertising material such as flyers, business cards, newspapers, etc.
Cross Promotion can also involve the assistance of other businesses who may share a similar niche market. This includes a joint strategy where each business endorses the other through various forms of advertising.