Linked from
The 46 pages that link to Gradient, each with the reason it gives.
Vector fieldRelated: It turns a scalar field into a vector field that points uphill.
Heat equationRelated: Temperature gradients drive conductive heat flux in Fourier's law.
Poisson's equationRelated: Taking its divergence produces the Laplacian in Poisson's equation.
ElectrostaticsRelated: The electric field is the negative spatial gradient of electric potential.
Tangent spaceRelated: A metric converts a function's differential into a tangent vector.
VectorRelated: It assigns a direction and magnitude to local change in a scalar quantity.
Hessian matrixRelated: The Hessian is the Jacobian matrix of the gradient.
LaplacianRelated: The Laplacian begins by taking the gradient of the scalar field.
Equipotential surfaceRelated: The electric field is the negative gradient of electric potential.
Level setRelated: Where nonzero, it is perpendicular to the function's level sets.
EquipotentialRelated: The gradient of the potential is perpendicular to its equipotentials.