More People are not aware of deleting the Facebook account permanently.
There are two difference between deactivating the account and Deleting the account.Deactivating:
It will disable your account and others cant see your profile or information but you can reactivate your account by simply logging into your Facebook Account.again.
Deleting:
It will permanently delete your profile and information from Facebook.
How to deactivate Facebook Account
Step 1:
First go to Account and click Account settings.
In your Account Settings, select Security tab and now you can see Deactivate your account click on it.
After clicking Deactivate your account,you will be redirected to Deactivate page of Facebook.
Fill the Following details and click CONFIRM.
Finished, Facebook account is Deactivated. Now,your profile will be not shown in any of your friends or any people on Facebook. You can reactivate the account by simply logging into your Facebook account with your old login id and password.
How to Delete Facebook Account Permanently
To Delete Facebook account permanently, First you should Delete everything which is related to your profile (example: Pictures, friends, Messages, Wall-Posts, news Feeds, mini-feeds, posted items, interests, groups, fan pages, applications, etc.) but before deleting Download the All information from your Facebook account.
then, go this link for PERMANENT DELETION