Minecraft is a sandbox game built on creativity. It is one of the best selling games of all time. If you have not played it, I highly recomend it. You can go into survival and see how well you do without dying or you can go into creative and have access to everything and make anything you want.
Minecraft live is a yearly event that minecraft hosts. The event is so they can recap everything that has happened in minecraft for the year and annouce the newest update. This year the hosted it in october and annouced the wild update. There will be a ton of new things being added to minecraft when it update.