Gmail 5.0.171119 for iPhone - Download
The official Gmail app for iOS
The features included in the application are more or less the same ones that you can access in a traditional browser environment. So you can mark messages as important, follow conversation threads, organize your emails into different inboxes and labels, attach and send files, or search for anything within your account.
The application will send you an alert whenever you receive a new message, so you'll always be aware of the state of your inbox.
Gmail's application works perfectly for iOS, making it easy for you to check your email whether you're using an iPhone, iPod Touch, or iPad.