The companion site for Elite:Dangerous with the game database, market data, trade routes, outfitting, engineers, blueprints, crafting, Thargoid war, squadrons, logbooks, galleries, galaxy information and much more...
It's one of those commodities I call "semi-rare". Worth stocking on the carrier if one plans surface construction. Perhaps for selling to other architects even if you are not. I used to have a cottage industry selling semi-rares and mission reward commodities for Tech Broker unlocks.