File systems is a fundamental computer science concept and research area concerned with the methods and structures used to organize, store, and retrieve data on persistent storage devices. It constitutes a core component of operating systems, defining the interface for interacting with stored information. Research in this domain investigates optimal strategies for data representation, access control, performance optimization, reliability, fault tolerance, and scalability across diverse storage media and computing environments. Key characteristics include hierarchical directory structures, file metadata management, mechanisms for data allocation and deallocation, and the provision of abstractions for users and applications to interact with data. Its significance lies in enabling efficient, reliable, and secure long-term data storage, critical for the functionality of modern computing systems and applications.