What is Batman v Superman: Dawn of Justice?

Quick Answer
Batman v Superman: Dawn of Justice is a 2016 American superhero film directed by Zack Snyder that pits Batman against Superman while a new threat, orchestrated by Lex Luthor, emerges.
Explanation
Batman v Superman: Dawn of Justice is a 2016 American superhero film and the second entry in the DC Extended Universe. Directed by Zack Snyder and written by Chris Terrio and David S. Goyer, it follows the events of Man of Steel and brings together the iconic characters Batman and Superman for the first time in a live‑action setting. The story centers on Gotham’s vigilante, Batman, fearing the unchecked power of the god‑like Superman, while Lex Luthor manipulates both heroes into conflict, ultimately unleashing a greater danger that threatens humanity. The film also introduces Wonder Woman in her first live‑action appearance, expanding the DCEU’s roster of heroes. The ensemble cast includes Ben Affleck (Batman), Henry Cavill (Superman), Gal Gadot (Wonder Woman), Amy Adams, Jesse Eisenberg, Diane Lane, Laurence Fishburne, Jeremy Irons, and Holly Hunter, and it was released by Warner Bros. Pictures with a mixed critical reception, earning a 6/10 rating on TMDB.