What is the difference between back to back letter of credit and transfer letter of credit?

back to back credit is a seller financing tool where seller goes to his bank for amendment of the master lc and get issued another lc in favor of the main supplier and also it is a LC where main buyer does not get to know that who is main supplier .

Bank which issues the back to back LC undertakes a definite payment obligation under L/C law and practice, while the bank that transfers a transferable L/C does not obligate to pay. Instead, the transferring bank usually pays after receipt of issuing bank's payment under the transferable credit.

a transerable is cannot be transferred until or unless it is mentioned in the master LC as tranferable.