Gunstar Green wrote:doom.wad should be Ultimate Doom which includes Episode 4: Thy Flesh Consumed. The unofficial 5th episode, Sigil, by John Romero is available as a free download from his site: https://romero.com/
Doom II is doom2.wad which is a separate install on Steam. If you've already played Doom II there won't be any additional content.
The only extra "official" levels for Doom II, titled No Rest for the Living, were released with the BFG Edition ports of Doom 3 and were developed by Nerve Software. There are also The Master Levels which were a collection of curated fan levels that id released (these are pretty hit and miss, mapping has come a long way since then).
Final Doom is it's own standalone thing. It's two separate 32 level campaigns using Doom II's assets by different design teams who originated from the Doom modding and mapping community of the time. plutonia.wad is The Plutonia Experiment by Dario and Milo Casali. tnt.wad is TNT: Evilution by a collaboration of fans called TeamTNT.
To put it simply though, these are the four main IWADs that make up the four official campaigns of classic Doom: doom.wad (The Ultimate Doom), doom2.wad (Doom II: Hell on Earth), plutonia.wad (The Plutonia Experiment), and tnt.wad (TNT: Evilution).
If you want more there is an unending abundance of fan content you can find through Doomworld's /idgames archive.
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