CentOS

I am a new user of centos or any linux based operating system.

Please let me know is putty necessary for log-in remote server form Centos.

If putty is needed then please help me to install it in root user and run from the terminal.

Thanks in advance.

This depends on what kind of machine you have locally.

If you have a local Linux machine (or any *BSD or *IX or MacOSX) that you can use, you can run the command ssh yourname@remoteserver.example.com to log in remotely to your server.

PuTTY is a Windows program that can be downloaded here. Trying to install PuTTY on CentOS would be rather pointless.