What is the purpose of the `rsync` command?

The rsync command is primarily designed to synchronize files and directories between different locations, which can be either local or across a network. This synchronization capability means that it only copies the differences between the source and the destination, making it efficient and useful for tasks such as backups, mirroring data, and keeping multiple locations in sync.

One of the key features of rsync is its ability to compare files and send only the parts that have changed rather than copying entire files. This capability significantly reduces the amount of data transferred, especially over slower networks or when dealing with large sets of files that change incrementally.

Additionally, rsync supports a variety of options, including preserving file permissions, timestamps, and ownership, making it a versatile tool for file management and backup solutions. In summary, its core purpose of file synchronization encompasses both local and remote operations, which is why the correct answer highlights the synchronization aspect.