Linked from
The 31 pages that link to Boltzmann distribution, each with the reason it gives.
Thermodynamic equilibriumRelated: It describes equilibrium populations of microscopic energy states.
Ising modelRelated: It converts the Ising energy of each configuration into its thermal probability.
KelvinRelated: Kelvin temperature sets the energy scale governing these populations.
Canonical ensembleRelated: It gives each accessible microstate its canonical probability weight.