Hard for you to comprehend I see.
Paper dust masks: These loose-fitting masks have only one strap and don’t form a tight seal to the wearer’s face. They are designed to stop liquid droplets and aerosols coming out of the wearer’s mouth, not filter the air coming in. With no filter and no facial seal, they are not designed to prevent the inhalation of respirable particles.
N95s and P100s: These respirators have two sets of straps and form a tight seal to the face. The entire respirator is made of filtering material. N95s are the most common, with P100s being more protective (similar to a HEPA filter). These respirators are certified by the National Institute for Occupational Safety and Health (NIOSH), so look for “NIOSH” and the designation “N95” or “P100” on the respirator.