I actually don't understand, what is this game jam? Is it's such a score on how many ratings I've got in my games? Or any other thing? What's great to share game gem?
Are you asking about what a specific game jam is, or what game jams are in general? itch.io has hosted thousands of game jams so it’s hard to know which one you’re talking about if you’re talking about something specific.
A Game jam is just kind of like a competition to make a game in a certain time period except your not really competing against other people, your competing against the time.