What did co-writing mean?

Co-writing is the merging of two or more different stories or novels in order to add new plots or characters to a new work. This method of writing was often used to create web novels, especially those that required a lot of plot and characters. Co-writing could be done by rearranging the story, adding new dialogue or plot twists to make the work more compact and interesting. At the same time, co-writing could also provide the author with more creative space and opportunities to express his imagination.