The term "amorphous" refers to substances that lack a defined shape or structure. Unlike crystalline materials, which have a regular arrangement of atoms, amorphous materials have a disordered arrangement. This characteristic can be found in various substances, such as glass and certain polymers, making them useful in many applications. In the context of science, amorphous solids do not have a sharp melting point; instead, they gradually soften when heated. This property is important in industries that utilize materials like silica or plastic, where flexibility and moldability are essential for creating products with specific shapes and functions.