Music that followed punk (in its truest sense). Tended to follow similiar ideals/ideas to Punk but thrived upon experimentation of sound. Punk ripped the
rulebook of music up and
post-punk follwed. Punk said that it didn't matter how well you can play your instrument as long as you have ideas and have a go.
Post-punk bands reacted against the
thre chord thrash formula that punk had become and widened its scope of ideas. It is a catch-all term that refers to a lot of very different bands that made music using ideas pulled from different places.