This version of Dungeons and Dragons was authored by Gary Gygax between 1977 and 1979 as a complete rewrite of the full set of the original Dungeons and Dragons rules, with an eye towards resolving inconsistencies and presenting a canonical form of the game.
Called Advanced Dungeons & Dragons, or AD&D, it is now commonly called "1st Edition".
Due to the Old School Renaissance (OSR) Movement and the rise of retroclones, sourcebooks and adventures that were not specifically put out by TSR are now grouped under AD&D First Edition (1e) Compatible Products