Simple definition
A Microsoft Purview sensitivity label classifies information and can apply consistent protection controls.
Technical definition
Depending on its configuration, a label can add visual markings, enforce encryption and usage rights, or configure privacy settings for supported Microsoft 365 containers.
What is it used for?
Associate a sensitivity level with a document, email, or container and apply controls appropriate to that classification.
Practical example
A document labeled Confidential can be encrypted and restricted to members of an approved group.
Common issues
- A label is too restrictive or users do not understand the protection
- The publishing policy does not target the intended users or locations
- Manual, default, and automated labeling rules conflict
How it works / role
The label is published to the relevant users or services. When it is applied manually or automatically, its classification metadata travels with the content and the configured protections are enforced. Compatible applications and services then read the label to maintain the intended restrictions.
Related terms
Microsoft Purview · DLP · Microsoft 365
Key takeaway: Exact behavior can vary by version, product, and architecture; always validate on the environment actually deployed.