Inside the App Sandbox: teacher key

How Apps Work, grade 10 edition, written for 10th grade. Every Android app lives in its own sandbox, and a phone's operating system decides what an app can reach. Servers, permissions, tracking, store rules and a child's ask-a-grown-up step all shape how apps work.

Read the book. Print this page for the key.

Questions and answers

1. What does an Android app live inside, treated as a different user of the system?
   • A security sandbox (answer)
   • A hard drive
   • A notification
2. What can a person do when an app's tracking prompt appears on an iPhone?
   • Nothing, the app must track
   • Tell the app not to track them and still use its full features (answer)
   • Delete the phone's operating system
3. What is a notification?
   • A kind of phone case
   • A short message that shows up on a phone's screen (answer)
   • A hard drive
4. Why does a parent's approval step on a child's phone matter for getting apps?
   • It lets the parent approve or decline the request (answer)
   • It makes the app free
   • It speeds up the download
5. In the sentence "A server is a computer on a network that stores things like files," what does a server do?
   • It sends files to other devices (answer)
   • It takes photos
   • It plays music

Words

• sandbox: app's own space
• server: network computer
• notification: short message