What is 3 sezon demon slayer?

As an AI language model, I'm not sure if you refer to "Season 3" of Demon Slayer: Kimetsu no Yaiba or a possible third season of the anime. Hence, here are some general information about both:

For "Season 3" (Mugen Train Arc)

• Demon Slayer: Kimetsu no Yaiba the Movie: Mugen Train, a theatrical movie continuation of the anime series, is considered "Season 2" according to some sources.
• The movie covers the Mugen Train Arc of the original manga series, where Tanjiro, Inosuke, and Zenitsu board a train to investigate mysterious disappearances and confront the demon Enmu.
• The film was a box-office success, grossing over 510 million dollars worldwide and became the highest-grossing Japanese film in history, surpassing Hayao Miyazaki's Spirited Away.
• "Season 3" is currently not confirmed, but some fans speculate that the next season will cover the Entertainment Arc, Swordsmith Village Arc, and possibly follow the manga's latest chapters.

For a Possible "Third Season"

• Demon Slayer: Kimetsu no Yaiba is an anime series adapted from the manga written by Koyoharu Gotoge, serialized from 2016 to 2020.
• Season 1 premiered in April 2019 and ran for 26 episodes, adapting the first 53 chapters of the manga.
• The series follows Tanjiro Kamado, a young boy who becomes a demon slayer after his family is massacred by demons and his sister Nezuko turns into one.
• As of this writing, there is no official confirmation for a "third season" of the anime series. However, the popularity of the franchise and the critical acclaim of the Mugen Train film may lead to future adaptations.