SEO or Search Engine Optimization or SMM Social Media Marketing both are the part of digital marketing. SEO is the procedure of getting ranking better in SERP organically on the other hand, SMM is the procedure of using social media channels like Facebook,Twitter, Linkedin, Google plus for promoting our brand.
[*]SEO- search engine optimization; following some of the Google rules in order to increase the chances of the Google search engine listing your site near the beginning of a list for particular keyword searches.
[*]SMM– social media marketing; in addition to the SMO, you guessed it, you pay to have an ad on the social media. This is how the Facebook ads show up on your page.