What is "gridFS" in MongoDB?

GridFS is a specification in MongoDB that facilitates the storage and retrieval of files that exceed the BSON-document size limit of 16 MB. It breaks these large files into smaller chunks and stores them as separate documents in a dedicated chunks collection. This is particularly useful for managing large binary files such as images, audio, and videos, as it enables efficient data management and retrieval. Additionally, GridFS allows metadata to be stored alongside the files, making it easier to query and retrieve the files based on their properties.

The other options do not pertain to the function of GridFS. Access control is handled through different mechanisms in MongoDB, visualization tools are not related to how data is stored, and while MongoDB does provide backup services, GridFS specifically relates to file storage rather than backup functionality.