Metal is a category of materials characterized by their ability to conduct electricity and heat, as well as their malleability and ductility. Common examples include iron, copper, and aluminum, which are widely used in construction, manufacturing, and electronics. Metals are typically solid at room temperature, with the exception of mercury. They play a crucial role in modern technology and infrastructure, forming the backbone of various industries. The extraction and processing of metals from ores is a significant part of the global economy, impacting everything from automobiles to electronics.