A temporal table is a powerful SQL Server feature that automatically tracks changes to data over time. It allows you to query what a row looked like at a previous point in time.

When temporal tables are enabled, SQL Server maintains a related history table. When a row is updated, the old version is stored in the history table. This provides change tracking without manually writing audit tables.

This feature is useful in accounting, HR, inventory and compliance systems. Previous addresses, product price history or contract status changes can be tracked with temporal tables.

Queries can use FOR SYSTEM_TIME to view data as it existed at a specific date. This is very useful for troubleshooting and historical reporting.

However, history tables can grow over time. Retention, archiving and performance strategies should be planned carefully. Temporal tables are powerful, but they need proper management.