Because, of this, this module will focus primarily on teaching you to use one specific search engine . Of course, with tens of thousands of new pages being added to the Web each day, no search engine is so good that it includes every single page. And some search engines are better than others, both in the number of web pages included, and in the power and efficiency of the searches that can be carried out by users. Like all computer searching devices, no search engine is perfect. All will find some pages that you are not interested in, and they will miss some pages that you would find relevant.
Most search engines are completely free to users.
Most search engines finance their operation by selling advertisements that appear whenever the engine is used. There are many different search engines and directories. We have already mentioned that each search engine and directory has different pages in its database. Also, each search engine and directory has different features , and requires different skills on the part of the user.