Email marketing and social media marketing are often compared, but they play different roles, and the clearest way to understand the difference is owned versus borrowed audiences. With email, the list of people who opted in is yours: you can reach them directly, and no platform stands between your message and their inbox. With social media, your followers are effectively borrowed from the network, which decides how many of them see any given post and can change those rules at any time. That makes email more predictable and durable, while social media is better at discovery, reaching new people who have never heard of you through sharing and algorithms. Their strengths are complementary. Social media is strong for visibility, personality, and meeting people early in their interest. Email is strong for nurturing a relationship over time, reminding past customers you exist, and sending a message you can be confident will actually arrive. The tone differs too: social posts are public and brief, while emails are personal and can go deeper. Cost and effort vary as well, but neither is simply better. Most small businesses do best treating them as partners: use social media to attract attention and invite people to join your email list, then use email to build a lasting relationship with the audience you genuinely own.