Linked from
The 35 pages that link to Metric tensor, each with the reason it gives.
SpacetimeRelated: The metric specifies how spacetime geometry determines measurable intervals.
GravitationRelated: Changes in the spacetime metric encode gravitational geometry.
Tensor calculusRelated: A metric raises and lowers indices and can determine a natural connection.
Four-vectorRelated: The Minkowski metric lowers indices and computes four-vector inner products.
Curved spacetimeRelated: It encodes the geometry from which spacetime curvature is calculated.