Google - best search engine which fetch data which you search within a fraction of milliseconds do you think life without Google - I personally do not think so - every information you can get it from Google.com. It is the most reliable, robust, fast and accurate search engine which provide information at your finger tips within micro seconds.
Creating and maintaining such a big search data is not a game of kid and apart from that retrieving data so fast is more challenging this day then anything else. Google is simple to use if you want to book hotel - google it, see address or review of restaurant, malls, schools, office etc - google it, need information on recipes - google it, need sex education related information - google it, need to download anything google it. Moreover, Google is also said has mother of Information Technology person as every single code for coding in any language is available of Google.
It has also other functions like map, blog, adsense etc, . which could be useful in many ways. Advantage - ample of information on your finger tips disadvantage - easy available of some secured information could create problems of any one.