Recent research suggests that there has been a big drop in enrollment in community colleges. Two-year community colleges fill the gap between high schools and four-year colleges. Some students take community college classes to get job training. Others go to community colleges to take lower-cost classes before moving to a four-year university. Community colleges can cost thousands of dollars less than four-year schools. But some students say credits for classes at community colleges do not always transfer to four-year colleges, and some employers say workers from community colleges are not always ready for jobs. At the same time, there are many jobs for people without a college education, which makes people believe they do not need college. Since 2010, the number of students at U.S. community colleges has dropped by 37 percent, or about 2.6 million students. Those numbers come from the National Student Clearinghouse Research Center, a non-profit group.