noun
the '80s; the eighties
Refers to the decade of the 1980s. Can be used for any century, but typically means the 1980s.
８０年代の音楽が好きです。
I like music from the 80s.
この映画は８０年代を舞台にしている。
This movie is set in the 80s.
Refers to the 1990s; same pattern with different decade number.
Compound of ８０ (eighty) and 年代 (era, decade).