Broadly speaking, termination of the services of an employee can be resorted to by any one of the following three kinds, namely, (1) Discharge, (2) Dismissal, and (3) Retrenchment.
Discharge
This can be further classified as (a) Discharge Simpliciter and (b) Discharge on the ground of continued ill health. Discharge simpliciter is commonly known as the termination of the services of an employee by the employer by giving notice or paying wages in lieu thereof as required under the contract of employment. Since it is not punitive in character and no stigma is attached to it, the discharged employee is entitled to all service benefits. However, it is not an absolute right enjoined upon an employer by the contract of employment, and the court can set aside the order of discharge simpliciter if found to be mala fide. Therefore, the exercise of this power should be just, fair, and reasonable and should not be arbitrary. For example, the services of a probationer can be terminated on the grounds of unsatisfactory performance within the probation period if so mentioned in the contract of employment or in the Standing Orders. In any other case, it has been held ultra vires of the constitution by various courts. Discharge on the grounds of continued ill health is purely on medical grounds, and the so-discharged employee is entitled to all service benefits.
Dismissal
Dismissal normally takes place on disciplinary grounds based on the omissions or commissions enumerated in the standing orders as misconduct. All the terminal benefits, including gratuity at times, stand forfeited depending upon the gravity of charges leveled and proved.
Retrenchment
Retrenchment has been defined under Section 2(OO) of the I.D. Act, 1947, as the termination by the employer of the service of a workman for any reason whatsoever, otherwise than as a punishment inflicted by way of disciplinary action, except voluntary retirement, retirement on reaching the age of superannuation, termination on account of non-renewal of the contract of employment on its expiry, and termination on the grounds of continued ill health. In the case of retrenchment, the employee is entitled to retrenchment compensation as detailed by Mr. Saikumar, in addition to all other terminal benefits.
Regarding the second part of your question, the answer is no. Depending upon the average number of workmen you employed in the preceding 12 months, you have to obtain prior permission from the appropriate Government before resorting to retrenchment; if the number of workmen is 100 or above, prior permission is mandatory. However, all the retrenched workmen are entitled to retrenchment compensation at 15 days last-drawn wages for every completed year of service. The process of retrenchment has to be according to seniority only, and the retrenched employees have preference over re-employment if they so desire.
Regards.