Real analysis is a branch of mathematics that focuses on the study of real numbers and their properties. It investigates the fundamental concepts of limits, continuity, sequences, series, and functions. Real analysis aims to provide a rigorous foundation for calculus and other areas of mathematics. It involves studying concepts like differentiation, integration, and the theory of measure and integration. Real analysis also extends into more advanced topics such as functional analysis and complex analysis. Overall, it is a key subject for those interested in deepening their understanding of mathematical analysis and building a strong mathematical background.