Hr intreview then technical intreview had a casual like talk with a singular team lead, had few technical questions, one about oop, seemed easy but still did no get the internship

HR called me via phone, asked me about my openings. After I said I have the time available (3 days) in a week, an interview date was set. HR started the interview, did not ask much about me, was more like a casual talk. She talk me through the openings in the company. Then, a technical interviewer has joined from the before mentioned teams, asked me about the classes I took, lessons i took and some OOP paradigms. After a while HR stuff came with an offer