Respirators are protective devices designed to filter out harmful substances from the air we breathe. They are commonly used in various settings, including construction sites, hospitals, and laboratories, to safeguard users from dust, chemicals, and infectious agents. Different types of respirators exist, such as N95 masks and full-face respirators, each serving specific purposes based on the level of protection required. These devices work by creating a barrier between the user and the environment, ensuring that only clean air is inhaled. Proper fit and usage are crucial for effectiveness, as a poorly fitted respirator can allow contaminants to enter. Regular maintenance and replacement of filters are also essential for optimal performance.