The fields row style displays each field defined in the view, one after another. Each field defines its own output.
By default, each field is put in a <div> unless it is selected to be inline. If it is inline, it is put in a <span>. Two items in <div>s will be displayed one after another, with the second one below the first. Two items in <span>s will be displayed on the same line. One item in a <span> next to <div>s is the same as two items in <div>s. This means that for the inline setting to do anything, at least two consecutive items must be set inline.
You may define a separator which will be placed between each item. This separator may be html. You can use to print blank space.