Linked from
The 34 pages that link to Differential form, each with the reason it gives.
DivergenceRelated: They express divergence through exterior differentiation and volume forms.
CurlRelated: They express circulation and Stokes' theorem without privileging coordinates.
Exterior algebraRelated: Differential forms take values in exterior powers of cotangent spaces.
Vector bundleRelated: Differential forms are sections of exterior powers of the cotangent bundle.