Large images often take a long time to download, a make reading a document very slow. Finding Resources WWW now comprises hundreds of thousands of documents and the number is growing exponentially. Browsing for what you want may be fun, but the chances are good that you will never find it just by wandering from page to page. At very best, you will miss some of the relevant pages. WWW provides two types or resources to help you find what you want, directories and search engines .
Directories are simply web documents which contain annotated menus or indices.
Sometimes there is a hierachical scheme which first presents list of topics and suptopics and finally lists the URLs that deal with that subtopic. You scan directories by eye, and when you find a topic that looks relevant, click on it to get a more focused sub-directory. Clicking on URL that looks relevant will cause the page to be displayed. You will be shown a list of URLs containing the keyword. Not all search engines are the same, because they utilize different databases of URL names and different search options.