What is a primary characteristic of Docker containers?

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The primary characteristic of Docker containers is that they allow for packaging and running applications. Docker containers encapsulate an application and its dependencies into a single object, ensuring that the application can run in any environment consistently. This approach solves many of the "it works on my machine" problems commonly faced in software development, as it isolates the software from the environment, providing a lightweight, stand-alone, and executable package.

Using Docker, developers can streamline the deployment process by ensuring that the application behaves the same way, regardless of where it is deployed. This ease of deployment and consistency across environments are fundamental benefits of using Docker containers, making it a cornerstone technology in modern software development and DevOps practices.

The other options do not capture the essence of what Docker containers are primarily used for: creating and managing isolated environments where applications can execute with all necessary libraries and configuration bundled together.