What does a HEPA filter stand for?

A HEPA filter stands for High-Efficiency Particulate Air filter. HEPA filters are designed to trap a large number of very small particles that other vacuum cleaners would simply recirculate back into the air of your home. They are commonly used in vacuum cleaners, air purifiers, and HVAC systems to improve indoor air quality by capturing fine particles like dust, pollen, pet dander, and other allergens.