When you want to merge objects in Illustrator, you need to use the Merge tool. The Merge tool is a three-dimensional object that allows you to combine two or more objects into one. The Merge tool is located at the bottom of the Illustrator window. To use the Merge tool, first select one of the objects you want to merge from the Object palette. Then click on the Merge button. The merged object will be placed at the bottom of your Illustrator window.