S513 - Your Source for Search Engine Marketing
The name S513 stands for : S=(S) 5=(E) 13=(M) SEM as in numbered letters from the alphabet.
Internet search marketing and site development
Search engine marketing, or SEM, is a form of Internet marketing that seeks to promote websites by getting them more visible in major search engines result pages (SERPs). SEM methods can include: SEO - search engine optimization, contextual blog marketing, paid placement, and paid inclusion.
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