Immediate employer (Contractor) can we make "Employment Contract" instead of "Appointment letter" with our employee?

Das Debraj
Being an immediate employer (Contractor) can we make "Employment Contract" instead of "Appointment letter" with our employee?
If so, is it mandatory to mention the contract period or it can be for the period for which we have contract with our Principal Employer?
2
Hi, You can mention the contract period and can extend when ever required to avoid any issues in future.
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