hi
SEO is search engine marketing and search engine marketing (SEM) and social media marketing (SMO) are the part of SEO, SEM is the paid marketing and SMO deals in the social media like facebook and twitter.

[DELETED]

SEM is the main and basic marketing method for the promotion of the business. And in SEM there are main two parts for getting the results as one is the paid way which include PPC , CPC like method. And the other is the SEO which is the unpaid method means it is the way to get the results naturally as free of cost and effectively also.
And SMO is the part of the SEO. As SEO is all about the site visibility and social media be helpful to drive traffic to the site and this way site be more visible.

[DELETED]

[DELETED]

[DELETED]

[DELETED]

[DELETED]

SEO (search engine optimization) means optimizing the page to be easily found and indexable by search engines.
SEM ( search engine marketing ) is the act of marketing a website via search engines, whether by improving rank in organic or natural listings, paid or sponsored listings or a combination of both.
SMO ( social Media Optimization) benefits organizations and individuals by providing an additional channel for customer support, a means to gain customer and competitive insight, recruitment and retention of new customers/business partners, and a method of managing their reputation online.

[DELETED]

[DELETED]

[DELETED]