# Aggregates Overview

The DataGrid exposes an Aggregates API through the `RadDataGrid.AggregateDescriptors` property where you can add [`PropertyAggregateDescriptors`](https://www.telerik.com/winui/documentation/controls/raddatagrid/aggregates/datagrid-propertyaggregatedescriptor) or [`DelegateAggregateDescriptors`](https://www.telerik.com/winui/documentation/controls/raddatagrid/aggregates/datagrid-delegateaggregatedescriptor).

The `PropertyAggregateDescriptor` enables you to utilize a set of available functions, while the `DelegateAggregateDescriptor` allows you to implement a custom function through the `IAggregateFunction` interface.

The `PropertyAggregateDescriptor` supports the following `KnownFunction` aggregates:

* `Sum`—The SUM function.
* `Min`—The MINIMUM function.
* `Max`—The MAXIMUM function.
* `Average`—The AVERAGE function.
* `Count`—The COUNT function.
* `Product`—The PRODUCT function.
* `StdDev`—The STANDARD DEVIATION, based on a sample function.
* `StdDevP`—The STANDARD DEVIATION, based on the entire population function.
* `Var`—The VARIANCE, based on a sample function.
* `VarP`—The VARIANCE, based on the entire population function.

## See Also

* [`PropertyAggregateDescriptors`](https://www.telerik.com/winui/documentation/controls/raddatagrid/aggregates/datagrid-propertyaggregatedescriptor)
* [`DelegateAggregateDescriptors`](https://www.telerik.com/winui/documentation/controls/raddatagrid/aggregates/datagrid-delegateaggregatedescriptor)