"Everything Has Changed" is a song written and performed by American singer-songwriter Taylor Swift and English singer-songwriter Ed Sheeran, taken from Swift's fourth studio album, Red (2012). Produced by Butch Walker, the track was released as the sixth single from the album on July 16, 2013. "Everything Has Changed" is a guitar ballad combining folk and pop genres about "wanting to get to know a new lover better".

The single gained mixed reviews from music critics, who were ambivalent towards its composition. "Everything Has Changed" peaked at number 32 on the US Billboard Hot 100 and entered the top ten charts of countries including Belgium, Ireland and the United Kingdom. A music video for "Everything Has Changed" was released of Swift's VEVO channel on June 6, 2013. Swift performed "Everything Has Changed" with Sheeran on Britain's Got Talent on June 8, 2013. Swift also performed the track on her Red Tour (2013).

It was reported that English singer-songwriter Ed Sheeran would appear as a guest artist on American recording artist Taylor Swift's then-upcoming album Red. On October 18, 2012, "Everything Has Changed" by Swift featuring Sheeran was leaked online. The song was written by Swift and Sheeran in Swift's backyard. "Everything Has Changed" is a guitar ballad, blending folk-pop genres. Written in the key of G-flat major, it has a moderate tempo of 84 beats per minute. The duo's vocal range spans from G♭₃ to D♭₅. Lyrically, the track talks about "wanting to get to know a new lover better". Swift further explained the song's theme, "Everything looks different to you because of this one person, because one new person came into your life. It’s really cool".

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