Microservices architecture is becoming increasingly popular as it enables organizations to build complex, scalable applications by breaking them down into smaller, independent services. Microservices architecture is a software development approach that structures an application as a collection of small, independent services that are loosely coupled and communicate with each other through APIs. Each microservice performs a specific function within the application and can be developed, deployed, and scaled independently. This approach offers several benefits, including improved modularity, scalability, and flexibility, as well as easier management and maintenance.

The sidecar pattern is a design pattern that involves attaching a secondary container or process to a primary container or process to provide additional functionality. In the context of microservices architecture, the sidecar pattern can be used to handle cross-cutting concerns such as security, configuration, and communication. The secondary container or process is referred to as the sidecar container or sidecar process.