Today i am discuss about two topics of SEO
Search directories
Non-Spidered Indexes.
Search Directories
A search directory is not a search engine. Do not let the similarity of the search fields fool you. When you search a search directory, you search an index hand picked by a living and breathing human being like you and me. When you use a search engine, on the other hand, you search a database inventory gathered by software based robots that travel the net, indexing the text of the webpages they find.
The indexes of directories like Yahoo and Pandia Plus do not contain the content of the webpages they link to. Instead they give you the title of the website and a short description. Furthermore, Yahoo and the Open Directory only contain some 2 million sites. That is nothing compared to giant search engines like Google and MSN.
So why are the directories useful? The key word is relevance. The search engines give you thousands of hits, including webpages of -- well -- dubious quality. The sites listed in the search directories on the other hand will normally hold a minimum standard.
Moreover, the directories are useful when you just have a general idea of what you are looking for. It is better to find the "renaissance art" category in Yahoo and explore the net from there, that to search for "renaissance art" with the Fast search engine. Fast will list any page that includes the term, even if its main topic is not Leonardo and Michelangelo.
In the directories, however, you are guaranteed to find websites with a lot of information in the field of your choice. These sites will in turn contain links to other sites specializing in this field. Below we list some of the best search directories
source
Pay per Click System
IT is an internet based advertisment method used on search engine and advertising network and content website where advertisers only pay when a user actually clicks on an advertisement to visit the advertisers' website. With search engines, advertisers typically bid on keyword phrases relevant to their target market. When a user types a keyword query matching an advertiser's keyword list, or views a webpage with relevant content, the advertisements may be displayed. Such advertisements are called sponsored links or sponsored ads, and appear adjacent to or above the "natural" or organic results on search engine results pages, or anywhere a webmaster or blogger chooses on a content page. Content websites commonly charge a fixed price for a click rather than use a bidding mechanism.
i will discuss in next article topic
Why use SEM?
Gathering Tools?
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