Define elastomer.

An elastomer is a type of polymer that has both viscosity and elasticity, allowing it to be stretched significantly when a force is applied and return to its original shape once the force is removed. This unique property makes elastomers highly versatile and useful in a range of applications, from automotive parts to medical supplies. The ability to stretch and recover is essential in applications where flexibility is needed, such as seals, gaskets, and tires. This characteristic distinguishes elastomers from other materials, contributing to their broad use in manufacturing.