A shield is a protective device, usually made of metal, wood, or other hard material, which is held in front of a person or object to protect it from injury or attack. Shields have been used since ancient times for both offensive and defensive purposes. For example, the ancient Greek Hoplites used large round shields to protect themselves from arrows and spears in battle. Medieval knights used shields with a pointed top to protect themselves from swords and lances. Today, police officers often use shields to protect themselves from thrown objects and projectiles.

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