Deactivate Facebook account, means putting your account to unavailable state for some time. You can activate it again any time by logging into your account.
Deactivating Facebook account is the better option for anyone who does not want to completely delete Facebook account, this means after deactivating Facebook, you can be able to reactivate again any time by login back.
Go to facebook official deactivate account page by following the link below:
Deactivating Facebook account will also deactivate your Facebook pages, if you are the only admin to that page, and if you are the group admin, another group member will be the admin role and you will lose your admin role even on reactivating your Facebook account.
Learn how to Deactivate Facebook Messenger click the link: How to deactivate Facebook Messenger