Cover, in the context of protection, refers to a layer or barrier that shields an object or individual from harm or adverse conditions. This can include physical covers like helmets for head protection, sunscreen to guard against UV rays, or insurance policies that provide financial security against unexpected events. In various settings, cover can also mean protective measures taken to ensure safety. For example, in military operations, soldiers use cover to shield themselves from enemy fire. In everyday life, people might seek cover from rain using an umbrella or from the sun using a canopy.