The ActiveCell property enables you to obtain an active cell, i.e., the cell that is in focus. It is the cell with which the user interacts.
The SelectedCell property returns the DevExpress.Spreadsheet.CellRange object that is the active cell of the current worksheet. However, unlike the ActiveCell property, it enables you to set the active cell by specifying the DevExpress.Spreadsheet.CellRange. The top left cell of the specified range becomes the selected cell.
The Selection property provides access to a cell range selected in the active worksheet. If there is more than one selected range in the worksheet, this property returns a complex (union) range that includes all the selected areas. You can access an individual range in the selection by its index in the DevExpress.Spreadsheet.CellRange.Areas collection.