Hi Ganesan,
This is Wil, one of the independent advisor, an expert with Windows 10 and a fellow Windows 10 user like you.
Spooler service or Print spooler service is, in simple terms, is the service that tells your computer to print. If you will turn it off, you won't be able to print, see your printer or install a printer. You may access it pressing Windows key + R, type services.msc and press enter. On the Services window, look for Print Spooler on the list. Print Spooler should always be running and set to automatic.
I hope the information I provided will help you. If you need further assistance please do reply back and I will respond as quickly as possible. Have a nice day.
Thanks,
Wilfred P.
Independent Advisor