Most services sending out mail through the United States Postal System should include a return address on their mailouts. Common services that one would receive mail from include banks, colleges and restaurants.

this is a very broad question.

The example of public communication is to inform everyone of its agenda.

Public communication can range from In Person to TV to Email marketing.

1. In Peson
   1. Presentation
   2. Meeting
   3. Debate
   4. Interview
   5. Written Conversations
2. Traditional media
   1. TV
   2. Billboards / Signs
3. Online media
   1. Social Media
   2. Blogs / Internet
   3. Email marketing

Here are some traditional Examples:

• When you are traveling abroad, you hear public service announcements,
• When you see traffic signs on the roads communicating safety expectations,
• When you hear of a pandemic like covid-19 and steps to adapt to avoid infection, you're encountering public communication or when you get information about polio etc.
• When you see, hear or read about steps to registering for census, you're being exposed to public communication.
• When a fire breaks out, or other public dangers, you're likely to get radio announcements warning the public of risks, safety measures and means of getting help.