What is a directory?

Let me start by saying search directories is a collection of categories and links. Directories are different form search engines and “Behavior nothing like a search engines”.pg212 for example “where a search engine collects entries using search crawlers or a robot search directories are populated people.” That searches the content.
The main differences between search engines and directories are:
Directory collecting entries, which are searched by groups of individuals that search the sites information and then include it to the search engine directory, search engines use crawlers and robots to collect the information that matches what the users looking for.
Sites are categorized:
Categorized websites as single entities according to the sites content, a search engine categorized a web site by keyword specified in the header tags that are located in the page content.
Limitation:
Directories unlike search engines have limits in a directory sites can only be placed in 1 or 2 categories unlike a search engine search is open to many categories and the only way your site can’t be found in a search engine is if the site has no keywords. Directories search by categories and sub categories and search engine search a site full context of a page. The only way your site can be added to a search engine directory is if you complete the submission phase. Make sure the following are met:
This plays a key role in sit approval in entering a search directory.
