bl, short for Buffer List, is a Node.js library designed for efficiently handling and manipulating streams of data in the form of Buffers. It simplifies working with fragmented or incomplete data, providing a single, cohesive Buffer representation. bl excels in scenarios where data arrives in chunks, offering methods for easy appending, slicing, and overall management of Buffer sequences. This makes it a valuable tool for parsing protocols, processing network streams, or handling file data in streaming applications.