Is triple sec and cointreau the same thing?

Triple sec is a category—liqueur made by triple-distilling orange peels and alcohol. Cointreau is a brand in the triple sec category, and a premium one at that. Triple sec tends to be more syrupy and sweet, while cointreau is a bit more balanced.

An alternative to orange liqueur is St-Germain Elderflower Liqueur, which is made using fresh elderflowers. While it won’t imitate the delicious orange flavor, its sweetly delicate, floral notes can add an elegant twist to your cocktails. Pair it with PATRÓN Silver and fresh lime juice to make a PATRÓN St~Rita, a fresh twist on the classic margarita.

Is triple sec and cointreau the same thing?