Evergreen content are texts, pictures, videos, and all other sort of content which is not "news" but rather timeless or always up to date. If you read a news about the unemployment rate of your home country, the information in that news will not likely to be accurate a year later. An article about the unemployment which is manually kept up to date with the latest statistics is more useful in the long run and can be "evergreen".
The process of updating content constantly to keep it fresh is, however, very time consuming. With the WebKnox, you can tap into a large knowledge base of information to automate that process though.
Having fresh content has several benefits such as:
To know what questions you can ask, you can always use WebKnox search functionality. The domains for which WebKnox can answer questions are constantly growing. Try asking about questions about counries, cities, movies, mobile phones for example.