An acute angle is an angle that measures less than 90 degrees. It is one of the basic types of angles in geometry, alongside right angles and obtuse angles. Acute angles can be found in various shapes and figures, such as triangles, where all three angles can be acute, making it an acute triangle. Acute angles are commonly encountered in everyday life, from the corners of a slice of pizza to the angles in a star shape. Understanding acute angles is essential in fields like architecture and engineering, where precise measurements are crucial for design and construction.