A shop traveler is the physical or digital record that "travels" with a job as it moves through manufacturing operations. At each step, the operator records what was done, the traveler captures quality data, and sign-offs confirm that the work meets specifications.
In regulated industries, the traveler is a compliance document. Aerospace (AS9100) and medical device (21 CFR Part 820) manufacturers must maintain complete production records that prove every operation was performed by qualified personnel, with correct tooling, using approved materials, and verified by inspection. The traveler is that proof.
Paper travelers create bottlenecks: they get lost, they queue at inspection stations, and post-production review of paper stacks takes days. Digital travelers eliminate these problems while also making the data searchable and analyzable for continuous improvement.