Tab order is also referred to as Next tab order
.Previous tab order
is the order in which the user can move from item to item on a page by pressing Shift+Tab. Previous tab order is often the opposite of next tab order; however, it is possible to set up next tab order and previous tab order so they are unrelated to each other.
When you insert items onto a page, the Designer automatically defines the tab order as the order in which you insert the items. (In other words, the default tab order is the same as the build order. In addition, the default previous tab order is the opposite of the default next tab order.) Unless you plan your form very well, this tab order will rarely be ideal. However, you can modify the tab order at any time.
Parent topic: Arranging items on a page