Guy tell me different b/w SEO Vs SEM.

Webmasters and content providers began optimizing sites for search engines in the mid-1990s, as the first search engines were cataloging the early Web. Initially, all webmasters needed to do was submit the address of a page, or URL, to the various engines which would send a "spider" to "crawl" that page, extract links to other pages from it, and return information found on the page to be indexed.[1]
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SEO is just a part of SEM...

SEO = Search engine optimization
SEM = Search engine marketing

PPC is also under SEM.

SEO is part and parcel of SEM. If you want to have an effective search engine marketing you might as well do a tedious SEO as well.

No SEM campaign is complete without SEO. Moreover, since the purpose of SEO is to make the site better for both search engines and users, you may find that it will suffice on its own. In any case, the advantages of SEO over the other aspects of SEM make it clear that, even if you are going to spend additional money on advertising and paid placement, SEO must be your first step in promoting your site






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