Emma Greenway is a fictional character from the movie Sweet Home Alabama, portrayed by actress Reese Witherspoon. She is a successful fashion designer who returns to her hometown in Alabama to finalize her divorce from her childhood sweetheart, Jake Perry. Throughout the film, Emma navigates her past relationships and personal growth while dealing with the complexities of love and commitment. The story explores themes of self-discovery and the importance of understanding one's roots, ultimately leading Emma to make significant choices about her future.