how to block websites with out any software

go to Run command and type below path

c:\WINDOWS\system32\drivers\etc\ and press enter

here you find hosts file open the file in note pad
type as below which site you want to block
for example i want to block facebook
127.0.0.1       localhost  localtdcop1
12.0.0.1(only one space) facebook.com

save the file then open facebook it will getting error...

Thank You