Linked from
The 12 pages that link to Jones calculus, each with the reason it gives.
PolarizationRelated: It tracks how optical components change polarization amplitudes and phases.
PolarimetryRelated: It models ideal polarimetric measurements when light is fully polarized.
Faraday effectRelated: It represents Faraday rotation as a transformation of the polarization state.
PolarizerRelated: Its matrix formalism models how a polarizer transforms a polarization state.