An acute triangle is a type of triangle where all three interior angles are less than 90 degrees. This means that each angle is sharp and pointed, giving the triangle a distinct appearance. Acute triangles can come in various forms, including equilateral triangles, where all angles are equal, and isosceles triangles, which have two equal angles. Acute triangles are important in geometry and can be found in various real-world applications, such as architecture and engineering. Understanding the properties of acute triangles helps in solving problems related to triangles, angles, and geometry.