what is the full form of nasa and isro

The National Aeronautics and Space Administration is an independent agency of the United States Federal Government responsible for the civilian space program, as well as aeronautics and aerospace research. NASA was established in 1958, succeeding the National Advisory Committee for Aeronautics (NACA). The new agency was to have a distinctly civilian orientation encouraging peaceful applications in space science.
The Indian Space Research Organisation is the space agency of the Government of India headquartered in the city of Bengaluru. Its vision is to "harness space technology for national development while pursuing space science research and planetary exploration." Indian National Committee for Space Research (INCOSPAR) was established by Jawaharlal Nehru, the first Prime Minister of the Indian Government under the DAE in 1962, with the urging of scientist Vikram Sarabhai recognizing the need in space research.

national aeronautics and space administration
indian space research organisation