Income Tax

Hi Guys/gals

I have a small question related to TDS and Advance Tax. Can anybody let me know what is the difference of the above topics in case of Employee.

I have the question as The company will deduct the TDS From the salary of the employee as a part of its obligation u/s 192 and at the same time it is also asking every person which includes individual employee to submit the self assessment Tax Return which isnothing but Advance Tax.

My qyestion as the company is regularly deducting the TDS from the salary of emplpoyee then why again to attract Advance Tax

Please help me out.
Himakar