This document discusses mobile application testing. It begins with an introduction of the author and their position at Seesaa Viet Nam .Co.,Ltd. It then covers topics such as what a mobile application is, the challenges of testing mobile apps, how mobile application testing is done, and the differences between testing mobile apps versus mobile web apps. It emphasizes using test automation, emulators, and actual devices during the testing process. It concludes with best practices for mobile application testing such as understanding the network and device landscape and performing various types of testing on actual devices.