Tin solder is a metal alloy primarily made of tin, often combined with other metals like lead or silver. It is widely used in electronics and plumbing for joining metal parts together. When heated, tin solder melts and flows into the joint, creating a strong bond as it cools and solidifies. This material is favored for its low melting point, which allows it to be used without damaging sensitive components. Lead-free solder options are also available, catering to health and environmental concerns. Overall, tin solder is essential in various applications, ensuring reliable connections in many industries.