The Stock and Inventory Management System represents a comprehensive solution designed to address the critical challenges faced by businesses in managing their inventory operations. This project develops a robust, console-based application using the C programming language that facilitates efficient tracking, monitoring, and management of stock levels, customer orders, supplier relationships, and financial transactions. The system incorporates a multi-user architecture supporting three distinct user roles: administrators with full system privileges, employees with operational access, and customers with purchasing capabilities. Through implementation of advanced data structures, file handling mechanisms, and secure authentication protocols, the system ensures data integrity and operational reliability. The application features real-time stock monitoring with automated low-stock alerts, comprehensive reporting capabilities, and seamless transaction processing. By utilizing structured programming principles and modular design patterns, the system demonstrates scalability potential while maintaining code maintainability. The file-based data persistence ensures data continuity across sessions, while the ASCII art interface enhances user engagement. This project successfully bridges the gap between theoretical computer science concepts and practical business applications, providing a foundation for future enhancements including database integration, web-based interfaces, and advanced analytics capabilities.