Radiant refers to something that emits light or energy, often associated with brightness and warmth. This term is commonly used in physics to describe the emission of energy in the form of waves or particles, such as light or heat. Radiant energy is crucial in various fields, including solar power and photovoltaics, where sunlight is converted into usable energy. In a more metaphorical sense, radiant can describe a person's demeanor or appearance, suggesting they exude positivity and warmth. For instance, someone might be described as having a radiant smile, indicating a joyful and inviting presence that lights up their surroundings.