Linked from
The 26 pages that link to Random walk, each with the reason it gives.
DiffusionRelated: Many independent random steps produce the large-scale spreading seen in diffusion.
Polymer physicsRelated: An ideal polymer chain can be modeled as a random walk through space.
Laplacian matrixRelated: Normalized Laplacians are algebraically linked to random walks on graphs.
Wald's equationRelated: The position at a stopping time is a random sum of the walk's increments.