Grid is a flexible grid area which contains columns and rows
Example:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid VerticalAlignment="Top" HorizontalAlignment="Left" Width="400" Height="100">
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock FontSize="20" FontWeight="Bold" Grid.ColumnSpan="3" Grid.Row="0" HorizontalAlignment="Center">Sales</TextBlock>
<TextBlock FontSize="12" FontWeight="Bold" Grid.Row="1" Grid.Column="0">January</TextBlock>
<TextBlock FontSize="12" FontWeight="Bold" Grid.Row="1" Grid.Column="1">February</TextBlock>
<TextBlock FontSize="12" FontWeight="Bold" Grid.Row="1" Grid.Column="2">March</TextBlock>
<TextBlock Grid.Row="2" Grid.Column="0">20000</TextBlock>
<TextBlock Grid.Row="2" Grid.Column="1">30000</TextBlock>
<TextBlock Grid.Row="2" Grid.Column="2">50000</TextBlock>
<TextBlock FontSize="16" FontWeight="Bold" Grid.ColumnSpan="3" Grid.Row="3">Total : 100000</TextBlock>
</Grid>
</Window>