Search Engines
Search engines use computer programs called Robots to automatically go from page to page through the web, reading content, and adding it to their databases. To speed up the process of getting your site indexed, they usually have a way for you to submit your site for indexing.
Directories
Directories are run by humans who review web sites and categorize them within their directories. This leads to a more abridged set of sites which can good or bad depending on what you're searching for.
Although there appears to be a wide range of information about a search marketing agency, they all seem to be brand specific. In order to find general non biased information one should view the Wikipedia site regarding search marketing. A search marketing agency is a company that provides the service of search marketing.
Marketing on search engines is is the new 'hot' trend in the sphere of website promotion and establishment. Search engine marketing is the way of analyzing a website and modifying it to enable search engines to read, understand, and index it correctly. In terms of short SEO is done to impress search engine.
Black Hat SEO: In search engine optimization (SEO) terminology, black hat SEO refers to the use of aggressive SEO strategies, techniques and tactics that focus only on search engines and not a human audience, and usually does not obey search engines guidelines.Some examples of black hat SEO techniques include keyword stuffing, invisible text, doorway pages, adding unrelated keywords to the page content or page swapping (changing the webpage entirely after it has been ranked by search engines). Also called Unethical SEO.
Black hat SEO means , SEO tactics which is not recognized by search engines and search engines find them illegal. i.e. hidden text, keyword spinning, URL redirection, keyword stuffing etc.
The purpose of the company Engines Marketer is to get their official site out to the public and well known. It can be beneficial to improve sales and get their reputation into the market.
These are the search engines and directories, which provides search results for Yahoo.BingYahoo directoryGoogleWikipediaDmoz
search engines and directories
Crawler based search engines such as google .com HUman powered directories and Hybrid search engines
Human powered directories are special types of search engines, organized into subject categories. The directories are smaller than most search engines and do not contain full text of the webpage they link to. Such directories are good when a user is interested in a general topic of search.
Google!
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results come from the Yahoo Directory
Meta Search Engines
Both search engines and web directories allows you to search for websites but results may vary because of the different configuration of their databases. Search engines are using crawlers / bots to read the content of websites and saving them in their database. Web directories are more organized because the websites are already categorized when submitted by humans.
Google is the most used, than Bing and Yahoo follow. All the other search engines are used by a very small percentage of world's population. Directories are not that popular anymore, since the invention of search engines.
Search engines look through all the sites and try to figure out what they are about. then when you search, they list the most relevant one. Directories are more like the phone book. Sometimes they sort by relevance or popularity, but often times they are just a list... like yellowpages.
There are literally hundreds of search engines on the web. For a relatively good list, see the related link below.