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Hi

SEO is search engine optimization and SEM is search engine marketing.. Both are use to promote sites but methods are different..SEM is use to get a traffic on sites by social networking sites...

I am the beginner in SEO, it is great information to share. Thanks

SEO is Search Engine Optimization and SEM is Search Engine Marketing SEM is paid and SEO is free. SEO is the best.

SEO and SEM are use for maximum traffic but they are use by different methods.