---
tag: 0W50MT1C6X
kind: concept
name: Trail
msc: [05C38]
sources:
  - url: https://en.wikipedia.org/wiki/Path_(graph_theory)
    locator: Walk, trail, and path
---

## Summary

A trail is a walk in a graph that uses each edge at most once. Trails are the setting of Eulerian problems. The node [[trail|062MQGP8M5]] gives the precise definition.