The main feature of a microservices architecture is its modular approach to software development. In this architecture, applications are broken down into smaller, independent services that communicate through APIs. Each microservice operates autonomously and focuses on a specific business function or capability, allowing for flexibility in development and deployment. This modularity facilitates easier updates, scalability, and maintenance, as individual services can be modified or replaced without affecting the entire system. Microservices enhance collaboration among teams, enabling faster innovation and improved fault isolation.