Lead-free solder is a type of solder used in electronics that does not contain lead, a toxic metal. It is primarily made from a combination of metals such as tin, silver, and copper. The shift to lead-free solder has been driven by health and environmental concerns, as lead can be harmful if ingested or released into the environment. The use of lead-free solder is now common in many industries, especially in the production of consumer electronics. Regulations like the RoHS (Restriction of Hazardous Substances) directive have encouraged manufacturers to adopt lead-free alternatives. While lead-free solder can have different melting points and properties, it is considered a safer option for both people and the planet.