How to block a website ?

Step 1:
Make sure about that you really want to block a website and ya if you then you have to know domain name of that website like "www.facebook.com"

Step 2:
Now you have to open your System Drive in your computer

Step 3:
If Your System is in drive C:\
then Go to this Path in your computer
"C:\Windows\System32\drivers\etc\"

Step 4:
There is a file called "hosts"
Open this file in your text editor(You can use your favorite one 'Notepad' :))

As shown in image after a localhost add your link which you want to block with the same IP address

Step 5:
Now Save this file in Any Other place and replace with d original one

Step 6:
Now you can able to see that Facebook is blocked in your computer
so, your friend can't able to use your laptop for Facebook although you give him..