Step 1 · Read the article
Open the article and read it at the level above. Then answer the questions below in your own words.
https://smallwhale.org/articles/ios
Step 2 · Questions
1. What is the core architectural components?
2. What is the proprietary status?
3. Why does iOS use parts from macOS and FreeBSD?
4. When did iOS first appear?
Step 3 · Words to know
Write what each word means, using the article.
Mach Microkernel
FreeBSD
Cocoa Touch
Unix-like
Step 4 · Two facts in your own words
Do not copy the article. Write two things you learned, the way you would explain them to a friend.