I assume you only wish to deactivate your account and not delete it.
You can deactivate your account temporarily and choose to come back whenever you want.
To deactivate your account:
Click the account menu at the top right of any Facebook page
Click General in the left column
Choose Manage your account
then follow the steps to confirm
If you deactivate your account your profile won’t be visible to other people on Facebook and people won’t be able to search for you. Some information, such as messages you sent to friends, may still be visible to others.
If you’d like to come back to Facebook after you’ve deactivated your account, you can reactivate your account at anytime by logging in with your email and password. Keep in mind, if you use your Facebook account to log into Facebook or somewhere else, your account will be reactivated. This means your Facebook profile, including things like your friends, photos and posts, will be completely restored. Remember that you'll need to have access to the email address you use to log in to reactivate your account.