What is the specific focus of mobile testing? How does it differ from web or backend testing?

Mobile testing has its own features that distinguish it from web or backend testing:

• Limited device resources: CPU, memory, battery — tests must consider performance and power consumption.
• Diversity of devices and OS: many models with different screens, Android/iOS versions, requiring testing on various configurations.
• Network conditions: mobile networks are unstable, testing behavior when switching between Wi-Fi and mobile internet, and when losing connection.
• Interaction with hardware functions: GPS, accelerometer, camera, sensors — need to verify their correct operation.
• UI/UX features: touch controls, different screen resolutions, screen orientation (portrait/landscape).
• App installation and updates: testing installation, updating, and removal through app stores.

Unlike web testing, which mainly tests browsers and servers, and backend testing, which checks APIs and logic, mobile testing is more comprehensive and related to hardware and user experience on devices.