How to block websites using hosts file?

Today let us see how to block websites using hosts file. This will helpful to administrator.

what is hosts file?
The host file contains Domain Name and IP address associated with them.  Your host file will be in this path:
C:\Windows\System32\drivers\etc\
Whenever we enter the Domainname or URL (for eg: www.webaddress.com), a query will be send to the DNS (Domain Name server).  This DNSconnect