The grid style will display each row of your view within a grid. You may customize the number of columns, though it defaults to 4. A grid looks like this:

row 1	row 2	row 3	row 4
row 5	row 6	row 7	row 8
row 9	row 10	row 11	row 12
row 13	row 14	row 15	row 16

The above uses the 'horizontal' alignment, where rows are added into the grid from left to right. With a vertical alignment, rows will be placed from top to bottom, like this:

row 1	row 5	row 9	row 13
row 2	row 6	row 10	row 14
row 3	row 7	row 11	row 15
row 4	row 8	row 12	row 16

This style uses a row style to determine what each row will look like.