Cloaking : Cloaking is a system of delivering custom content to a spider but hiding the code and / or content from a user. Cloaking can be a dangerous method of getting listed in the search engines and may not be recommended.

CPC : CPC or Cost per Click advertising means you will pay a certain price every time your banner ad is clicked by a user, regardless of how many times it is displayed.

CPM : CPM means Cost Per Thousand impressions. It is the price paid by an advertiser for a web site displaying their banner ad a thousand times.

Keyword / Keyphrase : A word or phrase that you type in when you are searching for information in the search engines. Also called ‘search terms’.

Keyword density : Keyword density calculates the percentage of keyword words and phrases compared to the total of words in your web page body.

Keyword Stuffing : Keyword stuffing is considered to be a unethical Search engine optimization (SEO) technique. It is the needless repetition of a keyword or keyword phrase in order to get higher ranking on search engines and this keyword or keyphrase may or may not be visible to human visitors.

Search Engine Spam : In the search engine world, spam is defined as the manipulation of a web page to give it an artificial boost in the search engine rankings.

Organic Listings - Organic listings are the non-paid search results lists seen in search engines, as opposed to paid or sponsored listings.