What is Git primarily used for?

Git is primarily used for version control to track changes in files, especially in software development. It allows teams of developers to collaborate on projects efficiently by providing a system to manage changes to source code over time. With Git, every change made to a file or set of files is recorded, which enables users to revert back to earlier versions if necessary, view the history of changes, and manage different branches of development.

This makes it an invaluable tool for coordinating efforts on shared projects and maintaining a clean history of modifications. It supports collaborative work, as multiple contributors can work on the same codebase without overwriting each other's changes, thanks to its branching and merging capabilities.

The other options focus on functionalities that are outside of Git's primary purpose. Creating graphic designs does not relate to Git’s function, nor does storing multimedia files securely, as Git is not primarily concerned with file storage security. Automating software installations has no direct connection to Git’s core functionality, which centers around tracking and managing changes in files rather than installation processes. Thus, version control is the central aspect for which Git is designed and widely used.