"Don't Forget" is a synth-pop and synth-rock song, which contains the guitar, horns, drums, and a syncopated dance beat.

"Don't Forget" was released as the second single for Ferreira's upcoming second studio album, Masochism.

[11] For Dazed, James Greig wrote that "Don't Forget" is angsty, and "at times spiteful".

[12] Reactions from the general public were positive, though Paper noted that a negative review by Sue Park of Pitchfork had caused a large amount of controversy.

[3] In the review, Park opined that "Don't Forget" was bland, and called the song's lyrics "vague".