Microservices architecture splits an application into small, independently deployable services, offering several advantages over a single monolithic codebase.
Key Points: • Each service can be developed, deployed, and scaled independently, so a high-traffic service can be scaled without scaling the entire application. • Teams can work on different services in parallel without stepping on each other's code, speeding up delivery. • A failure in one service doesn't necessarily bring down the whole application, improving overall availability. • Different services can use different technologies or languages best suited to their specific problem. • Smaller, focused codebases are easier to understand, test, and maintain than one large monolith.
Example: An e-commerce platform can scale just its Product Search service during a big sale without also scaling the Customer Support or Reporting services, saving infrastructure cost compared to scaling an entire monolith uniformly.
Interview Tip: A concise interview answer is:
"Microservices let each part of the system be built, deployed, and scaled independently, which means faster releases, better fault isolation, and the flexibility to use the right tool for each job. The trade-off is added operational complexity, but for systems that need to evolve and scale different parts at different rates, it's usually worth it."