This report provides a comprehensive overview of marketing, digital marketing, and social media marketing (SMM). It begins by defining marketing and explaining its importance in reaching target customers, including the role of effective marketing and distribution channels in boosting sales and profit. The report details the marketing mix (product, price, place, promotion) and the communication mix, and then moves on to digital marketing, explaining it as a mode of promotion using the internet and digital communication tools. SMM is defined as the use of social media to market products and services, and the report analyzes the use of digital marketing and SMM in business, highlighting their advantages such as building customer reach and brand recognition. The report includes examples of social media content from Depop and Greggs, with justifications for their effectiveness. The conclusion summarizes the importance of marketing, digital marketing, and SMM in achieving business success. This report is contributed by a student and is published on Desklib, a platform that provides AI-based study tools for students.