What is called a brittle material? What is called a ductile material?

(N/A) $1$. Brittle Material: $A$ material is called brittle if it breaks or fractures suddenly without undergoing significant plastic deformation when subjected to an external force. Examples include glass,ceramics,and cast iron.
$2$. Ductile Material: $A$ material is called ductile if it can be drawn into thin wires or undergoes significant plastic deformation before breaking when subjected to a tensile force. Examples include copper,aluminum,and mild steel.