Search engine optimization (SEO) can be described as strategies and tactics used to ensure that a site is accessible to a search engine and improves the chances that the site will be found by the search engine.

SEM is a broader term than SEO, and is used to encompass different options available to use a search engine’s technology, including paid ads. It includes things such as search engine optimization, paid listings and other search-engine related services and functions that will increase exposure and traffic to your Website.

The difference between these two is paramount when it comes to allocate marketing funds and key business resources. SEO is focused on organic search results — getting to the top of the list when a user searches for keywords related to your business. SEM revolves around choosing the right keywords to invest advertising dollars in when you want to appear in the paid search results on major search engines. Combining the two into one cohesive strategy can be exceptionally beneficial for your business.

Also Read 

• Why SEO is so important ?
• 3 pillars of search engine optimization
• What’s Hot in SEO in 2014
• How to choose a SEO company