Groups are useful for giving identical orders with a single command. Two or more units can be grouped together by selecting them and clicking on the group button. Their unit cards will be ordered together under a numbered tab. Select the tab to give identical orders to every unit in the group. Dissolve a group by selecting it and pressing the group button again.
Units or ships that have been formed into groups can be set into fixed formations designed to enable certain types of strategy. Notice the group formation options slide out from the side of the screen when a group is selected.