Search engines are computer programs that
search the internet looking for specific information. They
should be used when you have a definite topic in mind. They
usually allow the user to do "Boolean" searches.
Meta-search engines are powerful computer
programs that search many other search engines. They should
be used to locate information about topics which have been
proven to be very difficult to find. They are much more
thorough than regular search engines and result in many
more hits, which is frequently a disadvantage.