SEO (Search Engine Optimization) and SMM (Social Media Marketing) are two distinct approaches to digital marketing. Here are four differences between the two:

1. Definition: SEO is the practice of optimizing your website to improve its ranking in search engine results pages (SERPs). SMM, on the other hand, involves promoting your brand or product through social media platforms like Facebook, Instagram, and Twitter.
2. Goal: The primary goal of SEO is to drive organic traffic to your website, while SMM focuses on building brand awareness and engagement through social media.
3. Approach: SEO is primarily focused on optimizing on-page and off-page factors to improve the search engine rankings of a website. SMM, on the other hand, involves creating engaging content and building a strong social media presence to attract and engage with followers.
4. Metrics: SEO success is typically measured by the number of visitors to a website and the conversion rate, while SMM success is measured by engagement metrics such as likes, shares, comments, and followers.

In summary, while SEO and SMM are both important components of digital marketing, they have different goals, approaches, and metrics for success. Understanding the differences between the two can help you determine which approach is best suited for achieving your marketing objectives.