Today, in this article let's play around with one of the interesting and most useful concepts in SharePoint 2010.
Question: What are Announcements?
In simple terms "A list of news items or information that is allowed to be shared across site accessing members".
I think we are now good to go and implement this wonderful concept.
Step 1: Open any specific SharePoint developed site in SharePoint 2010.

Step 2: Navigate to "Site Actions" -> "More Options...":

Step 3: Select "Announcements" from the listed categories:

Step 4: Give a name for the announcement:

Step 5: The announcement is now created; the site looks like this:

Step 6: Creating a new announcement

Step 7: The announcement created site looks like this:

Step 8: Viewing the announcement:

I hope this article is useful for you.