An N95 mask is a type of respiratory protective device designed to filter out at least 95% of airborne particles, including large respiratory droplets and smaller aerosols. It fits snugly over the nose and mouth, creating a tight seal to minimize leakage. N95 masks are commonly used in healthcare settings and during public health emergencies to reduce the risk of infection. These masks are made from multiple layers of synthetic material, which helps trap particles. They are often recommended for use in situations where there is a high risk of exposure to viruses, such as during outbreaks of COVID-19 or other respiratory illnesses.