What is the purpose of the 'docker-compose' tool?

The 'docker-compose' tool is designed specifically to simplify the management of multiple containers. It allows users to define and run applications composed of multiple Docker containers using a single configuration file, typically called 'docker-compose.yml'. This file can specify all the services, networks, and volumes needed for the application, facilitating easier coordination of complex applications that depend on various inter-related services.

Using 'docker-compose', users can start, stop, and manage their multi-container applications with a single command, which streamlines the workflow significantly in development and testing environments. This is particularly useful when an application comprises multiple microservices, as it ensures that all required containers can be brought up and configured together in a cohesive manner.

In contrast, the other options are related to different functions and tools within the Docker ecosystem. Enhancing network security requires configurations and practices outside the scope of 'docker-compose', while monitoring performance metrics typically involves other tools designed specifically for that purpose. Similarly, displaying logs in real time can be accomplished with various logging drivers and monitoring tools, rather than being a primary function of 'docker-compose'.