In Internet marketing, search engine marketing, or SEM, is a set of marketing methods to increase the visibility of a website in search engine results pages (SERPs). The three main methods are:

• Search engine optimization, or improving rankings for relevant keywords in search results by rectifying the website structure, and content such that they could be easly read and understood by the search engine's software programs. It is seen that website containing the latest trends and updates are first available to the visitor.
• Paid search advertising involves paying the search engine company for a guaranteed high ranking or an ad displayed aside the results (commonly known as pay per click advertising or PPC).

Search engine placement marketers are experts and firms who explore of weaknesses and strengths in the methods and individual products to find the best way to promote a particular website in search engines.