There are 2 alternative ways to get your Facebook account offline. The primary is deactivating, that means:

You’ll activate your account whenever you wish.
People can’t see your Facebook Timeline, or explore for you.

Some data might stay visible (like messages you’ve sent).
Facebook saves your account information (like friends and interests) just in case if  you are having a activated account.

But Deleting your account could be a much more serious matter. If you delete your Facebook account:

Facebook delays deletion for some days when the request is formed. If you log in throughout the grace period, the deletion process is cancelled.

You can not access your account once it get deactivated .
It will take up to three months for your knowledge that’s hold on in backup systems to be deleted.

However, your information isn’t accessible on Facebook throughout this time.
Some things are not  kept in your account, like messages  ,chats that you’ve sent to friends–

These will stay active
Copies of some material (like log records) might stay in Facebook’s info. However they are “disassociated from personal identifiers” according to the company.

Basically, Deactivating could be a way to cool removed from Facebook for a while, whereas Deleting could be a permanent answer that you just ought to consider carefully regarding before selecting between the two options.