An isosceles triangle is a type of triangle that has at least two sides of equal length. The angles opposite these equal sides are also equal, which gives the triangle its unique properties. This symmetry makes isosceles triangles easy to recognize and useful in various geometric applications. Isosceles triangles can be found in many real-world structures, such as bridges and buildings, where stability is important. They are also commonly used in art and design due to their pleasing shape. Understanding isosceles triangles is fundamental in the study of geometry and helps in solving various mathematical problems.