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Home / Glossary / CASB
Glossary · Security

CASB

Cloud Access Security Broker

In plain language

A service that sits between your staff and cloud apps to see which apps are used and enforce your rules.

The metaphor

Like a checkpoint at the entrance to a shared office tower: it logs who goes where and stops visits to unapproved floors.

Going deeper

How it works

  • It finds cloud apps staff use, including unapproved ones.
  • It can block risky uploads and downloads.
  • It is used by larger organisations.
  • Small offices manage the same risk through approved-app lists.
In practice
  • A larger firm finds fifty file-sharing tools in use.
  • A security team blocks personal storage for work data.
  • An office keeps a short list of approved apps instead.

A question owners ask

Is it necessary for a small office?

Rarely. An approved-app list and tenant settings cover most of it.

Related terms
AAAAuthentication, Authorization, and AccountingAccount takeoverACLAccess Control ListAdmin accountAESAdvanced Encryption StandardAES-256Advanced Encryption Standards 256-bitAISAutomated Indicator SharingAPTAdvanced Persistent Threat

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