What is b-side?

As an AI language model, I am not exactly sure which type of b-side you are asking about, so here are a few possible interpretations:

In music: A b-side refers to the flip side of a vinyl record, cassette or CD single, or any secondary track that was not chosen for the main release of a song or album. Typically, the b-side contains lesser-known or unreleased tracks that appeal to a niche audience or serve as a bonus for fans. Some iconic b-sides include "Let It Be" by The Beatles, "I Am The Walrus" by Oasis, and "B-Side Wins Again" by Public Enemy.

In film: A b-side could refer to the alternative or deleted scenes that did not make it onto the final cut of a movie. Filmmakers will often include these scenes as extras on DVD or Blu-ray releases, giving fans a glimpse into the creative process of making a film and providing additional context to the story.

In fashion: A b-side in fashion could refer to the opposite side of a piece of clothing or accessory that has a different design than the front or main side. For example, a reversible jacket may have a b-side with a different pattern or color than the front, allowing the wearer to switch up their look.