>>96736219
>Dungeons & Dragons
The original product. It was a lot of quality issues (editing, assumptions, etc.) but it also had no competition.
>Basic Dungeons and Dragons
An attempt to edit the original Dungeons & Dragons to be more beginner friendly.
It deliberately left out a lot of the content of Dungeons & Dragons with the intention of being a supplemental product.
>Advanced Dungeons & Dragons
Dungeons & Dragons, all official expansions, and new material bundled together in a better edited product.
Basic and Advanced were simultaneous and incompatible product lines for a while. Don't ask me why.
>Advanced Dungeons & Dragons 2nd Edition
They remade everything with Gary Gygax's named filed off after he was ousted in a corporate takeover.
~ TSR went out of business and WotC bought the rights to D&D ~
>Dungeons & Dragons 3rd Edition
WotC remade everything so they could make money.
>Dungeons & Dragons 3.5
Balance patch.
>Dungeons & Dragons 4th Edition
This is essentially the second edition of WotC's D&D branded tactical miniature game, not a successor to their RPG product line.
I don't remember exactly why they axed 3rd edition for this. It might have had something to do with 3rd party licensing issues.
>Dungeons & Dragons 5th Edition
A return to form after 4th edition didn't do so hot.
~ honorable mention ~
>Pathfinder
Legally distinct Dungeons & Dragons 3.5 by a company that used to make lots of 3rd party expansions for D&D 3e.
They made Pathfinder after 4e was announced so they could keep catering to their own customer base.
>Pathfinder Second Edition
I don't know what this is about.
>Old School Reference and Index Compilation
Legally distinct Advanced Dungeons & Dragons for people to make 3rd party expansions for AD&D.