Hints from the above paragraph should have given you enough clues to guess what this product is. It was originally created as a water displacement, hence the first two letters in the name, WD. And since it wasn't perfected until the 40th try, it was named WD-40.
You can always find a can or two of this stuff around my house and for sure, it goes with us in our vehicles. There are many uses for it, some practical and some ridiculous. Do you keep a can of it handy? What are some of the uses you have found for it? Keep things lubricated and moving freely without any squeaks and have a great day, you hear?