What is Mobile Marketing?

From Wikepedia, it mentions the  book "Factors influencing consumers’ willingness to accept mobile advertising: a conceptual model", mobile marketing is broadly defined as “the use of the mobile medium as a means of marketing communication". 

Besides, from the book "Mobile marketing communications in consumer markets" gives a more specific definition on mobile marketing which is using interactive wireless media to provide customers with time and location sensitive, personalized information that promotes goods, services and ideas, thereby generating value for all stakeholders. 

The types of mobile marketing include sms mobile marketing, mms mobile marketing, mobile web marketing,QR code mobile marketing and so on.

Google and Yahoo! as displayed on mobile phones

 Source from: http://en.wikipedia.org/wiki/Mobile_marketing

(This is a school assignment.)