# Understanding your reservations
<a name="understanding-ri"></a>

You can use the Amazon Cost and Usage Reports (Amazon CUR) to track your Reserved Instance (RI) utilization, charges, and allocations. This section is an in-depth description to understand your reservations.

**Topics**
+ [Understanding your reservation line items](regular-reserved-instances.md)
+ [Understanding your amortized reservation data](amortized-reservation.md)
+ [Monitoring your size flexible reservations for Amazon EC2](monitor-flexible-reservation.md)
+ [Monitoring your On-Demand capacity reservations](monitor-ondemand-reservations.md)