Content & Privacy Restrictions
You decide the type of content that appears on your device. Block inappropriate content, purchases, and downloads, and set your privacy settings with Content & Privacy Restrictions. (excerpt from Apple Support Site)
Content & Privacy restrictions is the replacement tool for Parental Restrictions. This tool is best utilized by also turning on the screen time passcode to prevent students from making changes to these settings after you have them set. A yearly review of the settings is wonderful opportunity to discuss your expectations with your student and learn more about their perceptions of how they want to use their iPad or iPhone.