The cosecant function, denoted as csc, is a trigonometric function that is the reciprocal of the sine function. For any angle θ, the cosecant is defined as csc(θ) = 1/sin(θ). This means that if the sine of an angle is known, the cosecant can be easily calculated by taking the reciprocal of that value. The cosecant function is primarily used in various fields such as mathematics, physics, and engineering. It is particularly useful in solving problems involving right triangles and in analyzing periodic phenomena, as it shares properties with other trigonometric functions like sine, cosine, and tangent.