District 21 is a fictional area in the popular book series The Hunger Games by Suzanne Collins. It is known for its focus on technology and innovation, particularly in the field of genetics. The district is responsible for creating advanced medical treatments and scientific research. In the story, District 21 is one of the many districts in the dystopian nation of Panem. Each district has its own specialization, and District 21's contributions are crucial for the overall functioning of the Capitol. The district's advancements often play a significant role in the plot, highlighting the themes of power and control.