What is Ace Lang? Ace Lang, formerly known as DECA U LANG, is an organization that prepares emerging leaders and entrepreneurs for careers in marketing, finance, hospitality and management in high schools and universities around the globe. It is a business case competition organization that allows students to take part in and compete against other schools. Why join Ace Lang? Well Ace Lang is renowned for allowing students to think outside of the lecture halls and seminars and take what they learn and put it to practice. With that being said, Ace Lang is highly recognized by employers and looks great on resumes. Not only is it fun, but allows for the opportunity to travel abroad to compete.