Soldering is a process in which two or more items are joined together by melting and putting a non-ferrous filler metal( solder) into the joint at a temperature below 430 °C ( 800°F), the filler metal having a lower metal point than the adjoining metal.
In brazing, the work piece metal also does not melt, but the filler metal is one that melts at a higher temperature than in soldering.
That's what differentiate SOLDERING from BRAZING.
In the past, nearly all solders contained lead, but environmental and health concerns have increasingly dictated use of lead-free alloys for electronics and plumbing purposes nevertheless they're still currently used and prohibited in some fields.