Telerik RadGrid is designed to eliminate the typical trade off associated with ASP.NET grid controls — rich functionality at the expense of weight and performance. Thanks to its innovative architecture, RadGrid is extremely fast and generates very little output. Added to this is true cross-browser support — Internet Explorer, all Gecko-based browsers, and Opera.
At the same time, RadGrid delivers top-of-the line features.
Interoperability with RadAjax and loading indicators- Dramatically improves the responsiveness of the component, simulates Windows-application like behavior, and minimizes the traffic to the server
Codeless data binding using the DataSourceControls
Data binding to business objects, sub-objects and nullable objects; client-side binding through web services or page methods
Rich client-side functionality- Expand/collapse, delete, resize, reorder, select, scroll (with options for static headers and static columns), etc.
Filtering for all built-in column types including an option for switching the default filter textboxes with other controls
Hierarchical grids with multiple tables at any level, templates for detail tables and self-referencing hierarchy
Outlook-style grouping for flat and hierarchical grids
Group footers/standard column footers with declarative aggregates calculation, calculated columns
Customizable RadConfirm dialogs
Client/server/AJAX hierarchy and group load modes
Auto-generated in-place/edit forms/popup editing, user controls and templates as custom edit forms
Easily customizable skinning mechanism (via the Skin property of the grid)
Automatic, multi-column and custom sorting
AJAX-based virtual scrolling for instant navigation in large data structures
Standard, advanced, alphabetical and custom paging, SEO-friendly paging and pager template support
Area and multi-row client/server selection
Flexible edit form validation mechanism
Various column types
Export to Excel/Word, PDF, CSV
Header context menu for column sorting/grouping/filtering or changing the columns visibility
Option to display the grid data in ListView/DataList-like layout
Option for AutoPostBack when clicking anywhere in a row
XHTML 1.1 and accessibility compliance (WCAG Level A)
Built-in right-to-left and ASP.NET localization support
WAI ARIA support
Drag-to-group and drag-to-reorder columns support for mobile devices
You can find a complete list of all key features here.