Solder is a low-melting alloy, especially one based on lead and tin or (for higher temperatures) on brass or silver, used for joining less fusible metals.
A printed circuit board is used to mechanically support and electrically connect electronic components using conductive pathways, tracks or signal traces etched from copper sheets laminated onto a non-conductive.
Etching Solution is a solution used to remove the copper layer of a PCB or a process of using a strong acid solution or mordant to cut into the unprotected parts of a metal surface to create a design.
Desoldering Braid or Solder Wick is a “wick” is a pre-fluxed copper braid that is used to remove solder, which allows components to be replaced and excess solder (e.g bridging) to be removed.