what are difference between SEO and SEM?
 

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Good question

SEM have done is a comprehensive and effective use of search engine network marketing and promotion. SEM the pursuit of the highest cost performance, with the smallest input, won the largest from search engine traffic, and produce commercial value.

SEO is a part of SEM
SEO is the process of gaining traffic from free, organic or natural listings on search engines.
SEM is a broader concept. It is the process of gaining traffic from both free (SEO) and paid (PPC etc) efforts.