Before we knew it, the term generative AI began to be used, such as ``This picture was drawn using generative AI'' and ``international rules for generative AI were discussed.'' Many people may feel uncomfortable with the term generative AI being used so often. Generative AI has quickly gained attention as a keyword for business reform. In this lecture, we will explain in an easy-to-understand way how it differs from conventional AI, what it can generate, and how to generate it. I hope that this lecture will give you an opportunity to actively utilize generative AI.