The term Digital Marketing comprises different Digital Methods and platforms through which customers can be reached easily, and offered products and services, without stress. Professional digital marketers understand how each Digital Marketing strategy works, which is best suited for what business and how it can reach set goals. Digital marketing is all about effective planning and implementation. But, for a Professional or business to know which suits the business more, it is better to know and understand deeply the terminologies in digital marketing. Some important terminologies in digital marketing that cannot be overlooked are SEO, SEM, SMO, and SMM. What do they mean, what do they do, and how do they help businesses in Digital Marketing?