Mobile advertising is a form of advertising via mobile phone

Mobile advertising is a form of advertising via mobile (wireless) phones or other mobile devices. It is a subset of mobile marketing.

Some see mobile advertising as closely related to online or internet advertising, though its reach is far greater - currently, most mobile advertising is targeted at mobile phones, that came estimably to a global total of 3 billion as of 2007, and will reach 4 billion in 2008. Notably computers, including desktops and laptops, are currently estimated at 800 million globally.

It is probable that advertisers and media industry will increasingly take account of a bigger and fast-growing mobile market, though it remains at around 1% of global advertising spend. Mobile media is evolving rapidly and while mobile phones will continue to be the mainstay, it is not clear whether mobile phones based on cellular backhaul or smartphones based on WiFi hot spot or WiMAX hot zone will also strengthen. However, such is the emergence of this form of advertising, that there is now a dedicated global awards ceremony organised every year by Visiongain.

As mobile phones outnumber TV sets by over 2 to 1, and internet users by nearly 3 to 1, and the total laptop and desktop PC population by over 4 to 1, advertisers in many markets have recently rushed to this media. In Spain 75% of mobile phone owners receive ads, in France 62% and in Japan 54%. More remarkably as mobile advertising matures, like in the most advanced markets, the user involvement also matures. In Japan today, already 44% of mobile phone owners click on ads they receive on their phones.
Resource:- http://en.wikipedia.org/wiki/Mobile_advertising