difference between SEO and SEM?

SEO stand for Search Engine optimization

SEM stand for Search Engine Marketing

SEO is one of the Part of SEM.

SEM = Search Engine Marketing. It includes SEO and paid techniques like paid inclusion and paid placement.

SEO = search engine optimization. optimizing your site for natural listings and directories.

SEO is a piece of SEM.

SEO is a long run marketing strategy

SEM is a short run marketing strategy

SEO is a part of SEM.
In SEM , PPC ,paid banner,all are avilable.
In short SEM is a fast process to get more traffic.

SEO is the act of optimising the HTML and other content of your website for relevant, targeted key phrases in order to attain higher natural listings than competing websites.

SEM is broader than SEO. It includes SEO and other areas to improve a sites visibility in search engine results pages, like paid listings and paid inclusions.

seo is one part of sem, seo means use some methods to make your site has a good rank on search engine,but sem means you should have income by some way,such as seo,ppc,etc

SEO considers how search engines work and what people search for.It may target different kinds of search, including image search, local search, video search and industry specific vertical search engines.

SEO - Search Engine Optimization - which focuses upon the natural search aspect of your website and how you rank in the search engines.

SEM/SM - Search Engine Marketing or Search Marketing involves many components, including SEO. PPC, Banner Ads, Text Link Building, Optimized Press Releases, Shopping Feeds for Comparison sites, Contextual Ads, Blogs, etc. are all included into that area along with SEO.

I think SEM should include SEO and also include paid Internet Marketing service like PPC and CPM.

Have a nice day,