Can you explain what is meant by the term 'Container' in the context of modern development and deployment technologies?

In modern development and deployment technologies, the term "Container" usually refers to an isolated environment that packages an application along with all its dependencies, libraries, and configurations to ensure consistent operation in any environment.

Containers allow applications to run quickly and predictably, regardless of the infrastructure — whether it's a local machine, a server, or the cloud. They are lighter than virtual machines because they use the host OS kernel but isolate processes and the filesystem.

A popular tool for working with containers is Docker. Containers are widely used to simplify development, testing, and deployment of applications, including Flutter applications on the server side or for CI/CD processes.