Over decades, concrete, block, stone, and brick foundations naturally weaken as mortar joints decay, tie-rod holes rust out, and block cavities collect moisture, creating new leak paths that didn't exist when the home was built. When looking at a concrete foundation, it isn't a matter of IF it will leak, but WHEN it will leak.
My mom started using it to quickly mop up the few drops of water that get on the floor after you wash your hands or load dishes into the dishwasher. Instead of using a new one every time, she just keeps one there, then uses her foot to mop up the excess water. She doesn't even need to bend down!