Gmail is a boon to the world as paper work has become secondary because of gmail where all the appointments, call letters and all the required fields are getting done with help of gmail not only for that purpose but also it is too good as a search engine to get knowledge and to improve our skills. To say in one word it is the only one which had changed the world.
And also the extensions are so good for extra help to avoid heavy burden for some unwanted tasks so it is far more better than other search engines and also sites