How to re-download App Store
My son deleted the App Store how to re install it
iPhone XR
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The App Store app is not one of the apps that can be deleted. The usual reason for it not being visible is when a restriction has been placed on purchasing. See: Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support
If that isn't the cause, try using search to see if that will locate it. Use Search on your iPhone, iPad, or iPod touch - Apple Support