This sound comes from Plants vs. Zombies, the tower defense game first released by PopCap in 2009. Players associate it with getting a new plant card, so it spread online as a quick shorthand for unlocks, rewards, and helpful new options. In short edits, creators use the cue when a label, object, or character appears and want that moment to feel earned. Its lasting appeal comes from how instantly it communicates progress to anyone familiar with the game.