# Active/Standby

### Active

Active is a state that indicates which application instance is operating the system.

### Standby

Standby is another instance state that indicates that the application instance is not performing any operations and is waiting to take over. (As opposed to [Master/Slave](/appendices/appendix-a-glossary/glossary-toolpack/glossary-tboamapp/master-slave.md) applications where the slave instance can still perform operations

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### Example

Example: toolpack\_sys\_manager is an active/standby type application. The active toolpack\_sys\_manager is the only instance that takes action on the whole system, the standby toolpack\_sys\_manager waits to takeover if the active toolpack\_sys\_manager fails.


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