A modular system is a design approach that breaks down a complex system into smaller, manageable parts called modules. Each module can function independently but can also work together with other modules to create a complete system. This flexibility allows for easier updates, repairs, and customization, making it popular in various fields, including software development and architecture. In a modular system, components can be added, removed, or replaced without affecting the entire system. For example, in software engineering, developers can create applications using modular code, allowing for efficient collaboration and maintenance. Similarly, in architecture, modular buildings can be constructed using pre-fabricated sections, speeding up the building process.