An installer is a person whose job is installing things, which means setting up equipment, systems, or fixtures so they work properly in their intended location. A cable installer comes to your house to set up your internet by running wires and connecting equipment. A solar panel installer climbs onto roofs to mount panels that capture sunlight for electricity. Other installers might set up dishwashers, air conditioners, security systems, or playground equipment.

Installation work requires both technical knowledge and careful attention to detail. An installer needs to understand how the equipment works, follow safety procedures, and solve unexpected problems. When your family gets new appliances, an installer might need to connect water lines, electrical wiring, or gas pipes while making sure everything meets building codes.

The word installer can also refer to a computer program that sets up software on your device. When you download a game or application, you run the installer, which copies files to the right locations and configures settings so the program works correctly. This digital meaning mirrors the human one: both take something that arrives in pieces and make it functional in its new home.