SEO is a process of increase site ranking and SMO is the process of increase traffic of a website.

SEO means search engine optimization and it will be use to increase the page rank of your website.
SMO means social media optimization in which you can do the website promotion with the help of social networking sites or video sharing.

SEO stands for search engine optimization and it is a technique of getting traffic and getting higher rank on search engine pages. SMO stands for social media optimization. In this promotion is done on various social media sites. It helps in getting traffic to your site.

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The main difference between SEO and SMO lies in the name itself. SEO stands for Search Engine Optimization and SMO stands for Social Media Optimization. SEO is the process of increasing the ranking of website in search engine and SMO is the process of improving the ranking in facebook, twitter, instagram, etc.

SMO and SEO both are different terms no doubt both have same destination and both are under the same category that is Internet Marketing. SMO Stands for Social Media Marketing, and SEO stands for Search Engine Optimization.
Social Media Optimization Include Blogging, Video Sharing, Image Sharing, Social Networking.
Search Engine Optimization On Page SEO and Off Page SEO.

SEARCH ENGINE OPTIMIZATION is Search Engine Marketing which is doing marketing of any site using various approaches while S M O is Social Media Optimization which is doing marketing by social networks.

SEO means search engine optimization.
SMO means social media optimization

The difference between SEO and SEM is simply that Search Engine Optimization is part of Search engine marketing or Search marketing as it is widely known. Both processes aim in increasing visibility in search engines. SEO is about optimizing the web property to get better rankings in the search results while SEM goes beyond SEO. It involves other methods as well which can get you more search engine visitors like PPC advertising.