The term REDBOOK RIVAL is referring to two popular magazines, Elle and Cosmopolitan. Elle is a French magazine that was founded in 1945 and focuses on fashion, beauty, health, and entertainment. Cosmopolitan is an American magazine that was founded in 1886 and focuses on topics such as relationships, sex, health, careers, self-improvement, celebrities, fashion, and beauty. Both magazines are popular among women and are considered rivals of the magazine Redbook.