Any time that songs, apps, or books are downloaded on another device using your Apple ID, they’ll also appear on your iPhone if automatic downloads is turned on – without needing to sync.
To turn this on, open Settings, then iTunes & App Store. Turn on the items you’d like to be downloaded automatically to your device.
By default, the App Store will update your apps automatically. However, you can switch off this behavior if you prefer.
Open Settings, select the iTunes & App Store option and turn off the Updates choice.
To update apps, open App Store, tap your Apple ID profile picture (which appears in the top right), and scroll down to see Available Updates. You can either update individual apps by tapping the Update button, or download and install all available updates by tapping Update All.