Blocked user
Blocked users are users who are unable to edit pages, upload files, move pages, create pages, and perform other actions that additional user rights would grant. Administrators or others with access to the blocking and unblocking interface may not block nor unblock others (except themselves) while blocked.
Blocked users can still view and edit their watchlists. Depending on the settings implemented on a block where specifically disallowed, users can typically edit their own user talk page, create new accounts, and/or send e-mails using Special:EmailUser (registered accounts only).
Administrators and stewards can block users (unregistered or logged in). Global sysops can also block users on wikis opted in to the global sysop wikiset.
On most Wikimedia wikis, admins who are blocked can (but generally shouldn't) block the admin who blocked them, but cannot unblock themselves unless they blocked themselves. Stewards, on the other hand, can always unblock themselves.
Not all blocks are based on fair rationales, if you can demonstrate your apologies to adminships, or if you can provide enough rationales against block reasons, your block status may be lifted, see block appeal on details.