Digital marketing is the use of electronic channels to market products and services to customers. It allows businesses to introduce products instantly to consumers anywhere through digital channels like search engines, smartphones, and tablets. There are many ways to learn digital marketing, including online courses, books, and programs from institutions. Digital marketing provides benefits like allowing small businesses to compete with large brands and use cost-effective strategies like live online chat. It is a growing industry with high job and salary prospects for roles like content creation, data analysis, and copywriting.