Each field is a particular part of the document or Web page record. Lists of every word in every field of each record and their position in the original document or Web page or other file. You never see these, but they facilitate your searching the Search Engine database. Remember, it takes months to update huge Search Engine databases, so many of the records will be outdated. Specifically, the original Web page, document, or other file may no longer exist, though the record of it may still be in the Search Engine database.
All users have to do is type their search terms into the blank entry fields.
The GUI also simplifies the display of the information resulting from a search. The commands tell the DBMS to search the Search Engine database for the information the user wants. Convert, format, and return to the user's computer and browser GUI the information that has been located by the search of the database.