The review discussed in this paper provides a unique synthesis of evidence and knowledge about carers. The authors adopted a scoping review methodology drawing on a wide range of material from many different sources published between 2000 and 2016. It offers key insights into what we know and how we know it; reinforces and expands evidence about carers’ profile; shows knowledge is uneven, e.g. much is known about working carers, young carers and carers of people with dementia but far less is about older carers or caring for someone with multiple needs.