If you are trying to determine what fluid has puddled on the ground under your car, here is a few tips to help make sense:

Brown Fluid………………………………………… Engine Oil
Red or Red/Brown Fluid………………………… Transmission Fluid
Green or Light Orange Fluid (Most newer GMs )… Engine Coolant / Antifreeze
Clear Water in the Summer……………………....... Water from air conditioning (Normal)
Blue Fluid…………………………………………… Windshield Washer Fluid