TGT: trained graduate teacher.
Least qualification required: b.ed and graduate in the subject you need to instruct.
TGT educates at the secondary level, i.e., from sixth to tenth.
PGT: Postgraduate teacher.
B.ed and post-graduation in the subject concerned is a prerequisite for PGT.
Likewise, PGTs educates senior secondary level, i.e., 11th and 12th.
PRT: primary teacher
The least capability required is confirmation in basic training or diploma in elementary teaching.
They educate from 1st to 5th.
TGT full form is Trained Graduate Teacher and it is not the name of courses it is a Job title..There are courses that are called TGT courses, like B.Ed is a TGT course.TGT teachers can teach the classes like 8–10th..and PGT full form is Post Graduate Teacher this means, if you are a post-graduate (eg., M.A.), and have done your B.Ed or M.Ed then you become a post graduate teacher. PGT can teach up to class XII...