To promote "Endless", an accompanying music video was shot by Alex Herron and uploaded onto Inna's YouTube channel on 24 November 2011 to positive response.

"Endless" was written and produced by Romanian trio Play & Win members Sebastian Barac, Radu Bolfea and Marcel Botezan.

[1][2][3][4] Jon O'Brien from AllMusic labelled the track — along with her previous single "Un Momento" (2011) — as "summery flamenco-tinged", and wrote that it "provide[s] the necessary Mediterranean 'booze cruise' vibes".

[5] Kevin Apaza from Direct Lyrics stated: "'Endless' is not your typical Inna party-ready tune, but one in which she shows her more vulnerable side, in a mellow synth production [...] which creates a really nice care-free atmosphere.

German magazine Laut writer Kai Butterweck pointed out "Endless" as one of the highlights on I Am the Club Rocker, calling it "slightly spherical".

[20][21] An accompanying music video for "Endless" was shot by Alex Herron, whom Inna had previously collaborated with for "Sun Is Up" (2010), "Club Rocker" (2011) and "Un Momento" (2011).

[22][23] Her Bring the Sun in My Life foundation was also launched, which enabled female victims of domestic violence to be counseled by campaign partners in Europe to find solutions to their situations in order to live without physical suffering and psychological trauma.

Towards the end of the visual — after what appears to be a scene of physical abuse — Inna rejects the man's attempt at minimising and reconciling, resulting in him taking his coat to leave.

[25] She also delivered a live performance of "Endless" at the World Trade Center Mexico City in September 2012 along with other material from I Am the Club Rocker.