"Flash Boys," authored by Michael Lewis, explores the world of high-frequency trading (HFT) and its impact on the stock market. The book reveals how HFT firms use advanced technology to gain an unfair advantage, often at the expense of ordinary investors. Central to the narrative is the story of Brad Katsuyama, who founded the Investors Exchange (IEX) to create a fairer trading environment. Since its publication in 2014, "Flash Boys" has sparked significant discussions about market fairness and led to increased scrutiny and regulation of HFT practices, highlighting the ongoing need for transparency and equity in financial markets.