What are the key features of the Boyer-Lindquist coordinates and how are they used in the study of black holes?

The Boyer-Lindquist coordinates are a set of coordinates used in general relativity to describe the spacetime around a rotating black hole. They are important because they allow for a more accurate description of the geometry near a black hole, taking into account its rotation. These coordinates are used in the study of black holes to calculate properties such as the event horizon, ergosphere, and the paths of particles and light near the black hole.