Fluid intelligence refers to the ability to think logically and solve problems in novel situations, independent of acquired knowledge. It involves reasoning, pattern recognition, and abstract thinking, allowing individuals to adapt to new challenges and environments. This type of intelligence is often contrasted with crystallized intelligence, which relies on learned knowledge and experience. Fluid intelligence is considered a key component of overall cognitive ability and is often assessed through tasks that require quick thinking and problem-solving skills. It tends to peak in early adulthood and may decline with age, although engaging in mentally stimulating activities can help maintain cognitive function over time.