Drop shadow is a technique used in Illustrator to create shadows on objects. It is a way to add depth and realism to your illustrations. To use drop shadow, you first need to create a basic shape for your object. This shape can be any type of shape, but it should be simple and easy to understand. Next, you need to add the drop shadow effect. To do this, select the drop shadow tool and click on the desired area of your object. Once clicked, the drop shadow will be added automatically to your object. Now that you have added the drop shadow effect, it is time to test it out! To do this, simply drag an object into an Illustrator document and then select the Drop Shadow tool from the Tools palette. When clicked, the dropshadow will be applied automatically!