Plomo, or lead, is a heavy metal with the chemical symbol Pb. It is dense, malleable, and has a low melting point, making it easy to shape and work with. Lead is commonly used in batteries, radiation shielding, and some types of solder. However, it is toxic to humans and can cause serious health issues, particularly in children. Lead is found naturally in the earth's crust and is often extracted from ores like galena. Due to its harmful effects, many countries have implemented regulations to limit lead exposure in products such as paint and plumbing.