Copal or Mastic are both resins, which are a type of natural polymer that is produced by plants and trees. Copal is a hard, brittle RESIN that is derived from the sap of certain trees in Central and South America, while Mastic is a softer, more pliable RESIN that is derived from the sap of certain trees in the Mediterranean region. Both resins have been used for centuries in various applications, such as varnishes, adhesives, and incense.