What is the difference between SEO and SEM?

Search engine optimization is a compartment or division of Search Engine Marketing. Search Engine Marketing includes seo and paid techniques like paid inclusion and paid placement. The purpose of SEO is to make a website more usable by search engines and internet users. SEM is not related to ranking its only related to tarffic either paid or free.
 

Hello friends,
SEM is one of the mainly well-known and famous methods of internet marketing where the entity can be marketed through a barrage of methods where as SEO happens to be one of the most appealing and efficient methods of optimizing websites. All the features that go into optimizing the website are very organic and principled and represent the best quality of authenticity. SEO ensures that when the user types in the necessary keyword, the website comes up in the first page of the search result pages within no time. SEM ensures that when the user searches for the concerned service over the web, then the portal promoting it is one of the first ones that come up.