Dear Vasu.
If you want details regarding PF and ESI there is lot of threads available in the citehr. And also you can google around to find out answers for your question. But here please mention salary structure i.e., Gross salary for ESI and Basic, DA and retention allowance for calculation of PF and what all deductions your company is making under head; deductions.
Where as payroll is concerned , it is a process of documentation to the effect of paying salaries to the employees. It can be done manually ( by only using registers etc) and by using computers - which makes the process easier...Say for example my company uses Microsoft excel for this purpose.Here an employee's data is maintained like Name, DOJ, No of days worked in the month,Basic salary, DA, HRA , Conveyance allowance,alll these things are mentioned to arrive at his gross salary from this deductions are made like PF,ESI,telephone charges,other things are deducted to arrive at net salary..Like this only in single sheet we can make all these provisions.This is in brief...
Please be specific on your doubts so that we can help u in better way
Regards,
Shreekanth.P.R