Do I need communities licenses in my org to give access to Salesforce communities?

Hi,

Even without communities licenses, external users have some access to your communities. Purchase Community Cloud licenses to allow members to log in or give access to Salesforce objects based on your business needs.If you intend to use your community as a public knowledge base for unauthenticated (or guest) users, you don’t have to purchase communities licenses. For example, guest users can access publicly available community pages to read content, review knowledge articles, and perform tasks that don’t require them to log in (such as creating cases).