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Overheating refers to a condition where the temperature of an object or system rises above its intended or safe operating limits. This can occur in various contexts, including electronics, engines, and biological organisms. In electronics, overheating can damage components, reduce performance, and lead to system failure. It is often caused by inadequate cooling, excessive power consumption, or environmental factors like high ambient temperatures. Electronic devices typically employ cooling mechanisms such as heatsinks, fans, or liquid cooling systems to dissipate excess heat.

In internal combustion engines, overheating, often called engine overheating, can cause severe damage to critical parts like the cylinder head and engine block. Common causes include low coolant levels, a malfunctioning thermostat, a faulty water pump, or a blocked radiator. Maintaining the proper coolant level and ensuring the cooling system is in good working order are crucial for preventing engine overheating.

In biological contexts, overheating in humans is known as hyperthermia. This can range from mild heat exhaustion to life-threatening heatstroke. It occurs when the body's thermoregulation mechanisms are overwhelmed, often due to prolonged exposure to high temperatures or strenuous physical activity in hot environments. Symptoms can include dizziness, nausea, rapid pulse, and confusion. Preventing hyperthermia involves staying hydrated, seeking shade, and avoiding strenuous activity during hot periods. Understanding the causes and consequences of overheating is important for maintaining the functionality and safety of various systems and organisms.