Second-hand iPhone is asking me to put an Apple ID
Hi,
For some years have been wishing to have an apple product, then it happened that I bought a second-hand iPhone, after while it went off, then I tried to open it again but it asking me to put an apple id and I don't know what that is and when I try to conduct the owner his fon is off since then and is now almost 6 months. I don't know what to do please help me so that I can access my phone.
[Re-Titled by Moderator]