retirement, it can only be sought for after rendering prescribed period of qualifying service. In the case of resignation, a prior permission is not mandatory while in the case of voluntary retirement, permission of the employer concerned is a requisite condition. Under Rule 16 of the 1958 Rules, an employee who seeks voluntary retirement has to give three months’ notice to enable the employer to complete the designated mode of acceptance. (See Halsbury’s Laws of England, 4th Edn., Vol. 9, p. 133.) Lastly, in a given case, the appointing authority may refuse to waive the said notice period which shows that resignation may be unilateral whereas voluntary retirement is bilateral. A similar question came up before this Court in UCO Bank v. Sanwar Mal (2004) 4 SCC 412 in which this Court has inter alia held that in the case of ‘resignation’, the relationship of employer and employee terminates on acceptance of resignation whereas in the case of ‘retirement’, voluntary or on superannuation, the relationship continues for the purposes of payment of retiral benefits. In the case of retirement, there is a nexus between such retirement and retiral benefits.”