The Angle-Side-Angle (ASA) criterion is a method used in geometry to determine the congruence of two triangles. According to this criterion, if two angles and the included side of one triangle are equal to the corresponding angles and side of another triangle, then the two triangles are congruent. This means they have the same shape and size. In practical terms, ASA can be applied in various fields, such as architecture and engineering, where precise measurements are crucial. By establishing congruence through ASA, one can ensure that structures maintain their intended design and stability, making it a valuable tool in geometry and construction.