Is tectonic a datapack?

Excuse me, but could you please clarify something for me? I came across the term 'tectonic' in the context of data packs and I'm wondering if it actually refers to a specific type of datapack. Is 'tectonic' indeed a datapack, or is it perhaps a misnomer, a term used colloquially, or perhaps it refers to a specific aspect or feature of datapacks that I'm not aware of? I'd appreciate any insight you can provide to help me better understand this topic.