The array.from() function in Flux is a new method introduced by the community that allows users to construct tables on the fly from an array of objects, overcoming limitations associated with alternative approaches such as manually editing Annotated CSV files or using the influx write command. This function writes data with timestamps in a human-readable RFC3339 format and saves time by not requiring authentication parameters, making it useful for constructing new temporary data, generating specialized tasks, and testing tasks to validate their operation.