Many banks ask newly selected probationary officers to sign a service bond for a fixed number of years.
If you resign before the bond period ends, you must pay the bond amount mentioned in the appointment letter.
The bond period and amount differ between banks — public sector banks and SBI have their own terms.
The details are always given in the offer or appointment letter, so read it before accepting.
Joining a bank is a commitment, so consider the bond terms before applying.