Which type of solid does not have a definite shape or melting point?

Amorphous solids are characterized by their lack of a definite shape and melting point. Unlike crystalline solids, which have a well-ordered, repeating lattice structure that allows them to maintain a specific geometric form and exhibit distinct melting points, amorphous solids do not have this orderly arrangement of particles. As a result, they do not transform from solid to liquid at a specific temperature like crystalline solids do. Instead, they may gradually soften over a range of temperatures. This means that the molecular arrangement in amorphous solids is random and disordered, contributing to their irregular shapes and behavior.