What is the purpose of a filter And water trap?

The purpose of a filter is to remove impurities, contaminants, and particles from a fluid, ensuring cleaner and safer water or air. A water trap, often used in Plumbing and HVAC systems, is designed to prevent gas or odor from escaping while allowing liquid to drain, thus maintaining a barrier against unwanted substances. Together, they help maintain the quality and safety of fluids in various applications.