Kiyoshi Ito was a prominent Japanese mathematician known for his significant contributions to the field of stochastic calculus. Born in 1915, he developed the Ito calculus, which is a mathematical framework used to analyze random processes. This work has had a profound impact on various fields, including finance, physics, and engineering. Ito's most notable achievement is the formulation of the Ito integral and the Ito's lemma, which are essential tools for modeling and solving problems involving uncertainty. His research laid the groundwork for modern financial mathematics, particularly in the pricing of derivatives and risk management strategies. Kiyoshi Ito passed away in 2008, leaving a lasting legacy in mathematics.