Apple Software Engineer Intern interview questions

After I applied, the recruiter emailed me with a few groups within Apple that were interested in me and set up 30 minute phone interviews with a person in the group. If the interview went well, I had a second hour long phone interview with two or three other people in the group.

Online referral by my friend in November. Got an email from the HR asking for suitable dates. So gave one in December first week. Received a call from the Hiring Manager wherein he briefed me about the position and asked about a specific project which was relevant to the position. It went okay and for 30 minutes. At the end of it, he informed me about another interview with an engineer. After that kept waiting and finally I got an email after 1 week from the HR notifying me of the second interview on Dec.17th. The second phone interview went pretty well as he was extremely cheerful. In that he asked me to describe about some specific details of the different projects I worked on as a part of the course work. Asked me about some basic data structures just to check whether I am aware of them. 2 days after that got the phone call from the HR informing me about the offer which was really unbelievable.