App Standby is a feature in Android that helps manage battery life by limiting the activity of apps that are not frequently used. When an app enters standby mode, it receives fewer background updates and notifications, which conserves power and extends battery life. This feature automatically identifies apps that you haven't used recently and reduces their resource usage. As a result, your device can prioritize power for the apps you use most often, ensuring a smoother experience while also helping to prolong the overall lifespan of your battery.