It was released on July 30, 2021, as the lead single from her second studio album of the same name.
The song is a pop-rock song with elements of emo and jazz.
The lyrics are about a woman who is trying to move on from a toxic relationship.
The song has been praised for its catchy melody, Eilish's vocals, and its relatable lyrics.
It has also been a commercial success, reaching number one on the Billboard Hot 100 chart.

Here are some additional facts about "Happier Than Ever":

The song was written by Eilish and her brother, Finneas O'Connell.
The song's music video was directed by Jake Schreier.
The song has been performed live by Eilish on several occasions, including at the 2021 American Music Awards and the 2022 Grammy Awards.
The song has been remixed by several artists, including Girl in Red and beabadoobee.

The title of the song, "Happier Than Ever", is a reference to the woman's newfound happiness after leaving her toxic relationship. The song is about a woman who is finally free to be herself, and who is no longer afraid to be happy. The song's lyrics are empowering and uplifting, and they are sure to resonate with anyone who has ever been in a toxic relationship.

"Happier Than Ever" is a beautiful and empowering song that is sure to touch the hearts of listeners of all ages. It is a perfect example of Eilish's unique and innovative sound, and it is sure to be a fan favorite for years to come.

The song has been nominated for six Grammy Awards, including Song of the Year, Record of the Year, and Album of the Year. It is also nominated for two Brit Awards, including Song of the Year and International Song of the Year.

"Happier Than Ever" is a powerful and moving song that is sure to stay with listeners for years to come. It is a testament to Eilish's talent as a singer and songwriter, and it is sure to cement her place as one of the most important voices in music today.

Billie Eilish - Happier Than Ever (Official Music Video)

When I'm away from you
I'm happier than ever
Wish I could explain it better
I wish it wasn't true

Give me a day or two to think of something clever
To write myself a letter
To tell me what to do, mm-mm
Do you read my interviews?
Or do you skip my avenue?
When you said you were passin' through
Was I even on your way?
I knew when I asked you to (When I asked you to)
Be cool about what I was tellin' you
You'd do the opposite of what you said you'd do (What you said you'd do)
And I'd end up more afraid
Don't say it isn't fair
You clearly werеn't aware that you made me misеrable
So if you really wanna know

When I'm away from you (When I'm away from you)
I'm happier than ever (Happier than ever)
Wish I could explain it better (Wish I could explain it better)
I wish it wasn't true, mm-mm

You call me again, drunk in your Benz
Drivin' home under the influence
You scared me to death, but I'm wastin' my breath
'Cause you only listen to your fuckin' friends
I don't relate to you
I don't relate to you, no
'Cause I'd never treat me this shitty
You made me hate this city

And I don't talk shit about you on the internet
Never told anyone anything bad
'Cause that shit's embarrassing, you were my everything
And all that you did was make me fuckin' sad
So don't waste the time I don't have
And don't try to make me feel bad
I could talk about every time that you showed up on time
But I'd have an empty line 'cause you never did
Never paid any mind to my mother or friends, so I
Shut 'em all out for you 'cause I was a kid

You ruined everything good
Always said you were misunderstood
Made all my moments your own
Just fuckin' leave me alone, yeah (Fuck you)
(Fuck you)
(Fuck you)