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The process for using Jenkins to automatically deploy a Docker container may vary depending on the specific setup and requirements, but typically involves the following steps:

1. Set up a Docker registry: This is a place where Docker images can be stored and retrieved. You can use a public registry like Docker Hub or set up a private one.

2. Prepare the Docker container: Create a Dockerfile that contains the instructions for building the container image. This may include installing dependencies, configuring the environment, and copying code into the container.

3. Build the container image: Use the Dockerfile to build the container image, and then push the image to the Docker registry.

4. Configure Jenkins: Install the Docker plugin on the Jenkins server, and configure it to connect to the Docker registry.

5. Set up Jenkins pipeline: Define a Jenkins pipeline that includes the following stages:

   a. Checkout: Get the latest code from the source code repository.

   b. Build: Build the container image using the Dockerfile.

   c. Test: Run any required tests on the container image.

   d. Push: Push the container image to the Docker registry.

   e. Deploy: Pull the container image from the Docker registry and deploy it to the production environment.

6. Run the pipeline: Trigger the pipeline either manually or automatically whenever there is a new commit to the source code repository.

By following these steps, you can automate the process of building and deploying Docker containers using Jenkins.