Dear,
CTC is cost to company, it means after hiring an employee what total cost company will pay to employee for a financial year. That's why it is always expressed in yearly terms.
Salary certificate is just a certificate in which HR declares that during this particular time how much company had paid to employee.
Salary slip is a doc in which ur almost all details regarding ur salary are mentioned like ur salary break up, pan no., DOJ, designation, bank a/c details, leaves avail, how many u have taken, any deduction, pf, esic, it, gratuity, net n gross pay etc.
Pay slip is almost like salary slip. Generally it is issued for temporary purpose like sometime
employee wants to take loan at that time it needed for bank. It is also issued for showing payment to agents, blue collar workers or those employees who r not on payroll of company.
If there is any mistake, pls correct me.
Regards
Sanju Singh