The key purpose is to promote brands through various forms of digital media. It is come to life by an extensive selection of service, product and brand marketing strategy, which mainly uses the Internet as a core promotional medium, in addition to mobile and traditional TV and radio. Digital marketing includes Internet marketing techniques, :: Such as search engine optimization (SEO), :: Search engine marketing (SEM) and link building. It also extends to non-Internet channels that provide digital media, :: Such as mobile phones (both SMS and MMS), callback and on-hold mobile ring tones, social media marketing, display advertising, e–books, optical disks and games, and any other form of digital media.