For-profit schools are educational institutions that are run by private, profit-seeking companies or organizations. There are two major types of for-profit schools. One type is known as an educational management organization, or EMO, and these are primary and secondary educational institutions. EMOs work with school districts or charter schools, using public funds to finance operations. The majority of for-profit schools in the K-12 sector in America function as EMOs, and have grown in number in recent years. The other category of for-profit schools are post-secondary institutions which operate as businesses, receiving fees from each student they enroll.