Memory comes from Undertale, the independent role-playing game created by Toby Fox and released in 2015. It appears as track 34 on the official Undertale soundtrack, a collection of original piano-led music written for the game. As clips from the game spread across YouTube, TikTok and fan edits, the track became a familiar shorthand for quiet, bittersweet moments, especially in tributes, lore videos and character retrospectives. Its simple melody and calm pacing have kept it in regular use long after the game's release, because it can signal nostalgia and loss without needing words or explanation.