What is difference between SEO & SEM?

SEO and SEM:

Well, the abbreviation of both the terms SEO (Search Engine Optimization) and SEM (Search Engine Marketing) tell us the differences. where SEO uses organic strategies to appear in search and SEM uses PAID strategies to appear in search.

The main difference between both the search engineis, Search Engine Optimization (SEO) is focused on to get traffic from organic search results,and the goal of Search Engine marketing (SEM) is to get traffic and visibility from paid search by through Google, Yahoo, Bing, and other search engines.Both of them is a long-term strategy that takes time to produce results.Both the search engine is far difference from eachother to increase traffic.