# System boot (classic)

A *system boot* is an activity of a device indicating that the device has been switched on.

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RELATED CONCEPT

* [Activity](https://docs.nexthink.com/platform/references/references-classic/glossary-classic/activity-classic)

RELATED REFERENCE

* [Boot and logon duration](https://docs.nexthink.com/platform/references/references-classic/database-information-and-organization-classic/boot-and-logon-duration-classic)