Grad

Grad[f, {x1, ..., xn}] gives the gradient (∂f/∂x1, ..., ∂f/∂xn).

Examples

Gradient of a scalar field:

Grad[x^2 + y^2 + z^2, {x, y, z}]
(* {2x, 2y, 2z} *)

2D gradient:

Grad[x*y, {x, y}]
(* {y, x} *)

Please visit the official Wolfram Language Reference for more details.