The main advantage of using a microservices architecture in software development is enhanced scalability and flexibility. In this approach, applications are built as a collection of small, independent services that communicate over APIs. This allows for easier deployment, maintenance, and upgrades of individual components without affecting the entire system. Microservices also enable development teams to work in parallel, improving productivity and accelerating time-to-market. Moreover, they help organizations adapt to changing business requirements by allowing better resource allocation and faster integration of new technologies.