The "Side-Side-Side (SSS)" criterion is a method used in geometry to determine if two triangles are congruent. According to this rule, if all three sides of one triangle are equal in length to the three sides of another triangle, then the two triangles are congruent. This means they have the same shape and size, although their positions may differ. Congruent triangles have corresponding angles that are also equal. The SSS criterion is particularly useful in various fields, including architecture, engineering, and mathematics, as it helps in solving problems related to triangle properties and relationships.