Gmail App is android version of gmail.com very easy to use and very usefull app. It comes with almost all android mobiles. You just need to configure only one time when you start using your mobile. No need install because it preloaded just update timely so you will get full features of gmail. This is the best mail service.
Pros :
1) Easy to use.
2) Safe messaging provides security to your important mail.
3) All organised categories of Inbox and folders.
4) Very less spam mails as compare to other mail.
5) It provides 15 gb storage space which is enough for storing important mails.
6) You can create multiple accounts for multipurpose use.
7) You can send single mail of 25 mb and maximum single attachment size is 10 mb.
Cons :
1) It will not show you same mail in android app which you sent from website gmail.com
2) If you are typing a mail and you receive a call gmail will store your data in draft but application does not open same last page as other applications.
Over all very good app and very helpfull app. I will give 4.5 out of 5 star to this app.