"Realize" is a song by American singer-songwriter Colbie Caillat, taken from her debut album, Coco (2007). In the song, Caillat sings of having romantic feelings for a best friend. It was the follow-up to her worldwide debut hit, "Bubbly", and was officially released in January 2008 as the second single from the album, peaking at number 20 on the Billboard Hot 100 chart, becoming her second top-twenty hit in the US. The song also charted in Canada and the Netherlands, reaching the top 40 in both countries.