Gmail

1. People

1.1. 26+526+

2. Software

2.1. Browser

2.1.1. Chrome

2.1.2. Internet Expoler

2.1.3. Baidu

2.1.4. Spark

2.1.5. Firefox

2.2. Application

2.2.1. IOS

2.2.2. Android

3. Hardware

3.1. Computer

3.2. Tablet

3.3. Mobile phone

4. Data

4.1. Mail

5. Procedure

5.1. Login

5.2. Create file

5.3. Save file

5.4. Sent mail

5.5. Contact