What are the Visible in Self-Service Portal and Visible in Public Knowledge Base checkboxes on a solution?

The Visible in Self-Service Portal and Visible in Public Knowledge Base checkboxes, when selected, indicate that a solution is available for external use on your organization’s Self-Service Portal and Customer Portal and public solutions. Solutions available for external use are regarded as published.

Visible in Public Knowledge Base only applies to solutions, not articles in the public knowledge base.

Note Starting with Spring ’12, the Self-Service portal isn’t available for new Salesforce orgs. Existing orgs continue to have access to the Self-Service portal.