When talking about a sequel, it refers to the continuation of a story that has already begun in the previous work. This can be a movie, a book, or even a video game, where events unfold further, revealing new details about beloved characters or worlds. A sequel is a kind of bridge that connects known events with new adventures, adding freshness to an already familiar story.
As for the question of what the Ukrainian equivalent of a sequel is, it is usually referred to as a continuation. This word quite accurately conveys the idea that the story has its development and does not end with the first part.