What is difference between SEO and SMO ?

[VictorHill]

SEO is refers to Search Engine Optimization, which helps to rank keywords or title phrase on search engine result pages. It provide organic traffic for your website and make more visibility of website on search engine.
SMO is also a part of digital marketing which refers social media optimization. It helps to make more visibility of your product or services on social media website like Facebook, Google Plus, Twitter etc. It provide referral traffic for your website.
Both digital marketing types help you better fo gathering lots of users on your website which improve the traffic on the website and make better money conversion.