Dear Mantu,
A charge sheet and a show cause notice are issued at different stages of misconduct. Show cause notices are typically issued before the charge sheets, based on the facts related to the employee's misconduct without any witness, and a written explanation is requested from the delinquent employee.
On the other hand, a charge sheet is issued when there is a complaint from the head of the department or a complaint from a witness regarding the employee's misconduct.
I hope this helps clarify the distinction between the two processes. Let me know if you need further information.
Best regards, [Your Name]