Formal Announcements:
* Press Release: A written statement issued to the media announcing a newsworthy event or development.
* Public Service Announcement (PSA): A non-commercial message broadcast on radio or television to inform the public about important issues or services.
* Proclamation: A formal declaration made by a government official or authority.
* Notice: A formal announcement that informs people about a specific event, change, or requirement.
* Circular: A written communication sent to a large group of people, often with a formal tone.
Informal Announcements:
* Announcement: A general term for any statement that informs people about something.
* Notice: A less formal term for an announcement, often used in public spaces.
* Bulletin: A brief announcement, often displayed in a public place.
Other terms:
* Statement: A formal declaration of a position or opinion.
* Declaration: A formal statement announcing something important.
The best term to use depends on the specific situation and the desired level of formality.