Kafi (IAST: Kāfi) is one of the ten basic thaats of Hindustani music from the Indian subcontinent.
So basically it adds Komal Gandhara to the Khamaj thaat.
Thus in ancient and medieval times, Kafi was considered as natural scale.
Kafi is a late evening raga and said to convey the mood of springtime.
Ragas in Kafi thaat include: