Generative art refers to art that has been created in whole or in part by an autonomous system. In the most common cases, it is a code that generates an image, some of whose parameters are predefined, and some are random within the range set by the artist. In the case of generative art, the art subject is the algorithm itself and the result of its execution (images, videos, interactive art).
In the case of generative art, the NFT is usually an algorithm that can produce a large number of images with sufficient variability while maintaining the concept and recognizability, limited to a certain number of copies, determined by a random set of characters (hash).
You can look at interactive examples of Generative Art here