Shankara is a raga in Hindustani classical music.
The raga is of audav-shadav nature, i.e., it has five swaras (notes) in the arohana (ascent) and six in the avarohana (descent).
It is an Uttaranga pradhan raga, with the higher notes on the saptak (octave) being used more frequently.
The rishabh (Re) is very weak, but yet significant in the way it supplements the gandhar (Ga).
This proper time to sing this raga is supposed to be the 2nd Prahar of the Night (9PM to 12AM)