|Geo data contributed to the OSM server consists of [wiki:/Help/Concepts/Object nodes, ways, and relations]. Because there are hundreds of mappers publishing their geo data on the OSM server it is important to track who published what data in which context. It would be tedious for mappers to describe why every single node and every single way is published. A more convenient approach is to package a group of related objects and assign the package itself a comment, instead of the individual objects.
|The OSM project calls such a package a '''[wiki:/Help/Concepts/Changeset changeset]'''. A '''changeset''' is a collection of related changes (new objects, object modifications, or object deletions) applied to OSM data.