Plumbing refers to the system of pipes, fixtures, and fittings that transport water and waste in buildings. It includes the installation and maintenance of sinks, toilets, showers, and water heaters. Proper plumbing ensures clean water supply and effective waste removal, which are essential for health and sanitation. HVAC stands for Heating, Ventilation, and Air Conditioning. This system regulates indoor climate by providing heating in winter, cooling in summer, and ensuring proper air circulation. HVAC systems improve comfort and air quality in homes and commercial spaces, making them vital for modern living.