TIG Welding is one type of welding amongst a few choices you have - MIG, Stick, Oxyacetylene, etc.
TIG can be used to weld copper, titanium
, even two dissimilar metals, and is handy for making tricky welds (e.g. s-curves, or welds on round things)..
TIG generates heat via an arc of electricity jumping from a (tungsten metal) electrode to the metal surfaces you intend to weld - usually aluminum or steel.
TIG stands for Tungsten Inert Gas, after the tungsten electrode
, and the sheath of inert gas (argon or an argon mixture) surrounding it.
Big thanks to Mose O'Griffin, who narrated, taught, and demonstrated.