Max For Live is exactly what its name implies, Max, for Live.
Max is an invaluable tool to anyone working in digital audio, and a rabbit hole of infinite depth for those daring enough to dive into it. We Ableton Live users are very fortunate in that our native DAW enables us to use Max directly within Live, not only giving us the space in which to create and share our own unique tools, but expand greatly upon Lives already tremendous capabilities.
As I am not a programmer I consider myself a relatively novice Max user. I think of my skills as rudimentary, but advanced enough to have started building some unique and useful devices for my own purposes, the gradual progress of which may be found under this heading.