This is a link to Milton Mayeroff's short (38 page) book on the ethics of caring, written in 1971. There's a lot of really good content in this book, which would be worth reading even independently of this course. It describes caring as taking on a voluntary obligation out of a feeling of devotion, based on a relationship that has a quality of 'being with' another person, seeing from their eyes rather than merely one's own, and as being a type of personal development, not merely subservience or service.