Inquiries concerning what it is that gives something it's identity and as a distinct individual, over time. Whether there is anything essential about a human being or self.
Exploring what is meant by sameness and difference. Using thought experiments, such as: I would still be me if I had a liver / brain transplant?
Enables us to reflect on who we are, and who we may want to be; what is important to us and of how we differ from other human and non-human creatures.