Grouping objects binds them together so you can manipulate them as a unit. For instance, if you want to move several objects yet keep them in the same positions relative to each other, you could group the objects and then move them as a unit.
Formatting applied to a group also affects all objects in the group. You could add a blue fill to all objects in a group by selecting the group and clicking a blue shade on the color palette. If you later need to work with the individual objects that make up the group, you can simply ungroup them.
Using the Pick Tool, select two or more objects. To select multiple objects, you can hold down while clicking the objects, or you can drag a marquee around the objects ( ...