Pressure testing is a method used to check the integrity and strength of various systems, such as pipelines, tanks, and vessels. This process involves filling the system with a fluid, usually water or air, and then applying pressure to ensure it can withstand operational conditions without leaking or failing. The results of pressure testing help identify any weaknesses or defects in the structure, allowing for necessary repairs before the system is put into service. This practice is essential in industries like oil and gas, construction, and manufacturing to ensure safety and compliance with regulations.