Function Loop is a utility for running a list of synchronous or asynchronous functions in sequence, with support for both callback-taking and promise-returning functions. It's designed for developers who need to execute a series of operations in order, whether they're synchronous or async, and handle completion or errors in a unified way. The module is "zalgo-preserving," meaning it maintains the synchronous or asynchronous nature of the functions while providing a Promise-based interface when needed.