Indie movies are independent, meaning they were made or distributed outside of the big studio industrial complex, and usually with a much smaller budget. They often have quirky characters, non-linear storylines, and tend to be more critically acclaimed.
They also don’t always fall into one particular genre, and are more slice-of-life narratives rather than big, epic stories.
Indie movies also don’t typically reach mass audiences the way big-budget movies do, making them favored by people with nonconformist attitudes — people who are indie.