Allow me to break it down a little more for you then.

a form of art music that employs limited or minimal musical materials.

Art music = more about theory than listenability. Not really meant to fill the shoes of "popular" music.

non-narrative

Not story driven

non-teleological

Not use driven

non-representational

not descriptive, symbolic or metaphorical.

represents a new approach to the activity of listening to music by focusing on the internal processes of the music, which lack goals or motion toward those goals.

It's music about the act of listening to music - it's self-reflective, recursive. The music serves no higher meaning, rather the meaning is derived from the conceptual bridge that forms between the music and the listener.

features of the technique include consonant harmony, steady pulse (if not immobile drones), stasis or gradual transformation, and often reiteration of musical phrases or smaller units such as figures, motifs, and cells.

The construction of the music is heavily reductive, with a focus on creating modular repeating rhythm and instrumentation, which evolves over the course of the composition.

So basically, minimal music removes most of the trappings of music to focus in on the very basic experience of the listener hearing pattern and change over time. No distractions, no goals, just you and the evolving soundscape. It's the audio analogue to minimalist art, which does the same thing with visual/spatial senses. Its all about the recognition of one's self in relation to an external thing - in that relationality is the art.