A concise introduction to digital marketing and the digital marketing channel map. The book explains the core idea of digital marketing, its practical benefits, convenience, low starting cost, faster, broader and deeper reach, measurability, targeting, relationship building, multi-way interaction, viral spread, and channel choice. It also places digital marketing within Promotion in the Marketing Mix and introduces source-named channels including SEO, PPC, Email Marketing, Social Media, and Display Networks, together with career directions in the field.