CTET stands for Central Teacher Eligibility Test.
It is a national-level examination conducted by the Central Board of Secondary Education (CBSE) in India.
The purpose of CTET is to determine a candidate's eligibility for appointment as a teacher for classes I to VIII in central government schools (like KVS, NVS), union territories, and schools that accept CTET scores.
UGC-NET and CSIR-NET are for determining eligibility for college/university lectureship and for Junior Research Fellowships.
NTA is the National Testing Agency that conducts various exams, but CTET is the specific exam for school teacher eligibility.