What does the `docker build` command do?

The docker build command is designed specifically to create a Docker image from a Dockerfile, which is a script containing a series of instructions for building a Docker image. The command processes the Dockerfile and assembles the image based on the specifications listed, including what base image to use, what files to copy, what environment variables to set, and what commands to run during the image creation process.

This process is crucial for automating the setup of containers, as it allows developers to define the application environment in a repeatable way. By executing docker build, the user can create a standardized image that can be shared and deployed across various environments, ensuring consistency and simplifying the development workflow.

Other options refer to actions that involve interacting with images or containers but do not pertain to the specific functionality of building an image from a Dockerfile.