What is the difference between lead and lead-free solder?

Soldering is a process that combines metal parts by melting a metal filler material and allowing it to flow into the joint. Soldering is commonly used to join pipes and electrical components in plumbing and electrical work.

Contrast on Soldering Technologies Used in Lead and Lead-Free

Tin-Lead Solder How it works, Application & Advantages

Is lead solder better than lead free solder? : r/soldering

Solder - Wikipedia

Leaded Solder vs Lead Free - Technotronix

What is the difference between lead and lead-free solder?

What is the difference between lead-free solder and tin-lead solder? - Quora

Solder wire - Low Quality Lead vs Lead Free

Lead-Free HASL Sierra Circuits

PCB Manufacturing and Lead vs. Lead-Free Solder - Absolute