What is the difference between a light novel and a web novel in Japan?

Light novel is generally speaking at a relatively higher quality, since that it is made into books and published. So it means it have a good popularity and less grammatical and logic issues. Web Novels is less strict in its requirements, because almost anyone can write a web novel and upload it on websites like Shousetsuka ni Narou. Web novels that are famous could be promoted into light novel and be published.