What is Selione, in one paragraph?

A guide called Iphthimé asks you about your life, day after day, for a long time. From what you tell her she builds your Echo: a digital self that remembers what you remember, reacts the way you react, and can still be spoken to long after you are gone. It is part interview, part journal, part slow game, and the thing it produces is an archive that belongs to you.