Warning lights refer to visual indicators that alert drivers or operators about potential hazards, malfunctions, or issues with their vehicle or equipment. These warning signals are usually in the form of brightly-colored LEDs (light emitting diodes) or incandescent bulbs that flash or remain lit when a problem arises. The specific meaning and purpose of these lights can vary depending on the context but they generally serve as an early alert to potential problems, allowing drivers or operators to take corrective action before more serious issues arise. Some common examples include engine malfunction indicator light (also known as "check engine" light), oil pressure warning light, coolant temperature warning light, and brake system warning light among others.