Eutectic composition refers to a specific mixture of two or more substances that has the lowest melting point compared to other mixtures of the same components. When cooled, this mixture solidifies at a single temperature, known as the eutectic point, where the components crystallize simultaneously. This unique property is important in various fields, including metallurgy and materials science. In a phase diagram, the eutectic composition is represented as a point where the liquid phase transforms into solid phases of the components. Understanding eutectic compositions helps in designing alloys and improving the performance of materials by controlling their melting and solidification behaviors.