The Knowledge section of the agent console uses a standard implementation of Salesforce Knowledge. A few sample knowledge articles are provided so you can view the default functionality of Salesforce Knowledge.
This feature is part of the Communications Cloud managed package.
When you've set up your Salesforce Knowledge base and created all the required knowledge base articles, agents can easily search in the Knowledge section of the agent console to view relevant articles. Agents who have the required license can also create new knowledge base articles.
For more information on setting up and using Knowledge, see Salesforce Knowledge.