[3][4] The song details Swims' reflection on saving his own life and finding the strength to leave an abusive relationship that had contributed to pushing his friends and family away.

The song also reached the top ten charts in the United Kingdom, Hungary, Belgium, the Netherlands, and Ireland, as well as the airplay charts in Croatia, Poland, Czech Republic, the Commonwealth of Independent States, Belarus, and Romania.

[9] In an interview with Rolling Stone, Alex Tear described "The Door" as a song that "just won't stop".

"[10] PopFiltr described it as a song which "offers a surprising juxtaposition of upbeat melodies and a powerful message."

They further added that "The Door" is a track that "challenges the listener to confront their own emotional boundaries, wrapped in an up-beat, almost paradoxical musical arrangement.