What is Sheshnaag-150, India's homegrown low-cost attack drone?

India is working on a homegrown low-cost drone named Sheshnaag-150. It is a long-range loitering munition. Unlike conventional missiles, which travel on fixed trajectory to reach target, loitering munitions can hover over assigned target area before diving into it to destroy it. The '150' is understood to represent the range at which the weapon can strike target, ie, 150 km.