The full form of NIOS is National Institute of Open Schooling. NIOS is the board of education under the Union Government of India. Formerly known as National open school, the name had been changed in the year 2002 as NIOS (National Institute of Open Schooling). It was established in 1989 by the Ministry of Human Resource Development (HRD) of the Government of India. The NIOS is a national board that administers examinations for Secondary and Senior Secondary examinations of open schools similar to the CBSE and the CISCE to increase literacy and provide education to rural and urban areas. It also offers vocational courses after the high school. National Institute of Open Schooling aimed to provide education to children of remote areas to increase literacy and flexible learning among them. The NIOS, despite being established for distance education provides a formal and regular Secondary and Senior Secondary program equivalent to CBSE. From 2004 to 2009, annually it had a cumulative enrollment of approx 1.5 million students at secondary level and at senior secondary levels it enrolls about 350,000 students which make it the largest open schooling system in the world.