what is the gemstone "amber made from?

http://24carat.co.uk/amberframe.html

http://www.all-that-gifts.com/se/amber.html

Amber is not technically a gemstone, but rather a fossilized tree resin. It is formed over millions of years from the resin of ancient trees, mainly conifers. When a tree is damaged or stressed, it produces resin as a part of its defense mechanism. Over time, this resin can trap and encase insects, plant matter, or even small animals, which then become preserved within the amber. The process of amber formation involves the slow hardening and fossilization of the resin. Once fully solidified, it can be polished and used for various purposes, such as jewelry or decorative objects. So, amber is created from the fossilized resin of ancient trees.