Dear Jyoti,
Simply put, all expenses incurred by a company for an employee are referred to as CTC. CTC stands for Gross Salary + Employer's Share to PF, ESI, Bonus, etc. + LTA + all fixed reimbursements (like medical, mobile, fuel, vehicle repair, etc.).
Gross salary encompasses all parts of the salary that are included in the salary chart or pay slip without any deductions, such as Basic, DA, HRA, CCA, Conv, Education and Medical Allowances, and all other allowances payable in the salary.
Take-home salary is calculated as Gross salary - (Employee's share of PF & ESI, and any tax (TDS and Prof tax) liabilities, welfare fund, etc.).
Manish Kumar