"Goodbye" is a song recorded by Romanian group The Humans, released on 12 January 2018 by Roton. The track was written by vocalist Cristina Caramarcu, while production and composition were handled by fellow members Alexandru Matei and Alin Neagoe. "Goodbye" is a 1980s-inspired soft rock and pop rock ballad whose instrumentation includes a cello; lyrically, it is a manifesto that discourages the abandonment of one's dreams. It also discusses the overcoming of suicidal ideation, depression and internal battles. Reviewers likened the track to the music of Bonnie Tyler, Celine Dion and Heart.

"Goodbye" represented Romania in the Eurovision Song Contest 2018 in Lisbon, Portugal after winning the pre-selection show Selecția Națională. The country failed to qualify for the Grand Final for the first time in their participation history. During their highly acclaimed show, The Humans performed choreography in front of several white and black, masked mannequins, representing depersonalization and the loss of identity in modern times. Music critics gave the song itself generally negative reviews, criticizing the recording as underwhelming; some expressed doubt that Romania would qualify.

To promote "Goodbye", the band performed the song on multiple occasions, including at the ITB Berlin in Germany, as well as in Israel, Spain and Portugal. An accompanying music video was directed by Anthony Icuagu and was uploaded onto Roton's official YouTube channel simultaneously with the single's release. It portrays The Humans in black outfits and features the use of white masks to allude to the equality of people.

The Humans is a Romanian band consisting of vocalist Cristina Caramarcu, guitarist Alexandru Cismaru, keyboardist Alexandru Matei, bassist Alin Neagoe and drummer Adi Tetrade. They are joined by cellist Corina Matei. Written by Caramarcu and produced and composed by Matei and Neagoe, their "Goodbye" is a 1980s-inspired soft rock and pop rock ballad whose instrumentation includes a cello. It runs at a length of three minutes. Fabien Randanne of 20 minutes noted its "vintage" nature, while likening it to the works of Welsh singer Bonnie Tyler. De Telegraaf's Richard van de Crommert called it "Celine Dion meets Bonnie Tyler and a touch of Heart". The song's melody was composed in 2011 or 2012 by Neagoe, with the track being fully produced and recorded in 2017. All used instruments were recorded live separately.

Regarding the recording's lyrical message, Caramarcu said: "'Goodbye' is a manifesto [...] and an urge to motivate one another not to give up our dreams," adding: "Say 'goodbye' to all the emotions that keep us on the spot, say 'goodbye' to limitations, conventions and step confident towards the future". During an interview with Wiwibloggs, the band stated that the song also discusses suicidal ideation and overcoming it. Benny Royston of Metro noticed "dark undertones of internal battles and breaking away from pain of depression". He compared the message to France, Italy and Israel's "theme[s] of public consciousness" captured in their entries for the Eurovision Song Contest 2018. "Goodbye" was made available for digital download on 12 January 2018 by Roton. A remix created by disc jockey Cristian Eberhard was also released in March 2018.

Music critics gave generally negative reviews of "Goodbye" following its release. Irving Wolther of Eurovision.de found the song to be unspectacular and predicted Romania would not qualify for the Grand Final of the Eurovision Song Contest for the first time. Similar negative response was captured in the comments on the contest's social media after an announcement regarding The Humans' participation. In a Wiwibloggs review containing several reviews from individual critics, Caramarcu's vocal delivery and stage presence was praised, although it was noted that song lacked energy and was "flat", "cheesy" and "retro". Overall, the reviewers on the website gave the song 5.83 out of 10 points. In a later review from Wiwibloggs that included a higher number of reviewers, the song was given a score of 4.94 out of 10 points. In a poll conducted by Romanian news agency DC News, more than 65% of voters said that The Humans did not deserve to win the national selection. Lead singer Caramarcu stated during interviews that the amount of criticism received from the audience was minor. She further elaborated:

"With regard to [the negative feedback captured in] foreign press and all sorts of articles and polls made by Eurovision-specialized sites, I know it is not a hate to us. Each of us has the right to like or not like something. [For example, in a] more negative article from one of the most-watched Eurovision blogs, [the author] basically did not appreciate our song. I met the person who wrote the article in Israel and he was very sincere: 'It is not the music I am listening to and it is not what we like. You are very fine and we love you.' Thus, I was able to understand, and I can still understand, that you cannot please everyone. You cannot be angry at someone just because they say their point of view."

An accompanying music video for "Goodbye" was uploaded simultaneously with the single's release on 12 January 2018 onto Roton's official YouTube channel. Directed by Anthony Icuagu, it features The Humans performing the song wearing black outfits. In interspersed shots, several people wear white masks, which the band said signifies that "in essence we are all the same, we are equal in the right to dream and aspire to the highest goals". For further promotion, The Humans appeared on various Romanian talk shows before and after their Selecția Națională win and commenced a tour in Europe. One destination was the ITB Berlin in Berlin, Germany, where promotional CDs of the song were handed. The band also had endeavours in Israel, Spain and Portugal. Regarding their tour, Caramarcu said in an interview with Adevărul: