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A heat shield is a barrier designed to protect an object or person from excessive heat by absorbing, reflecting, or dissipating heat away from it, commonly used in applications like automotive exhaust systems and spacecraft re-entry to shield sensitive components from extreme temperatures; essentially, it acts as a thermal barrier between a heat source and the object needing protection.

Key points about heat shields:
Function:
To prevent heat from reaching a specific area by absorbing, reflecting, or dissipating it.

Common applications:
Automotive engines (protecting components from exhaust heat), spacecraft re-entry (withstanding extreme atmospheric friction).

Material properties:
Heat shields are typically made from materials with high heat resistance, like ceramic composites or special heat-resistant alloys.