Dear SK,
CTC means "COSTS TO COMPANY."
Normally, all corporates budget the cost of an employee before engaging them so that they are aware of the actual costs they would incur upon employing them. This would include the employee's pay package (Basic, HRA, Conveyance, Medical, and other Allowances). In addition to this, there would be additional costs incurred by the company, such as Employers Provident Contribution, Gratuity Provision, and Statutory Bonus Provision. These costs are the liability of the company and are therefore shown in the entitlement sheet attached to the appointment letter. These costs would not be reflected in your salary slips as they are company costs.
Moreover, the addition of these costs to the entitlement sheet also inflates the figures in the CTC, which many employees may not realize. Normally, these costs are budgeted to each individual department that hires such employees so that the costs versus department output (productivity) can be analyzed.