A plumber is a professional who specializes in the installation, repair, and maintenance of plumbing systems. These systems include pipes, fittings, and fixtures that are used to transport water and waste throughout a building. Plumbers also work with heating and cooling systems, as well as other mechanical systems that are connected to plumbing.

The job of a plumber typically includes:

• Reading blueprints and building codes to determine the layout of plumbing systems;
• Installing and maintaining plumbing systems, including pipes, fittings, and fixtures;
• Repairing and maintaining pipes and fixtures, including replacing parts as needed;
• Installing and maintaining heating and cooling systems, including boilers, heaters, and air conditioning units;
• Identifying and troubleshooting problems with plumbing systems;
• Inspecting and testing plumbing systems to ensure they are functioning properly;
• Providing maintenance and repair services for both residential and commercial properties;
• Communicating with customers to explain the work that needs to be done and provide estimates for services.

Plumbers are required to have the proper licenses and certifications in order to work in their field. They may also be required to complete ongoing training and continuing education in order to stay current with the latest techniques and technologies.

In summary, plumbers are responsible for installing, repairing, and maintaining plumbing systems, which include pipes, fittings, and fixtures that transport water and waste throughout a building. They also work with heating and cooling systems, and other mechanical systems that are connected to plumbing. They must have proper licenses and certifications, and may also be required to complete ongoing training and continuing education to stay current with the latest techniques and technologies.