There are perhaps two parts that you might not understand - the rules of the sport (or specifically this trick shot), and the celebrity players on the team of the 1993 Chicago Bulls.

The rules are mostly discussed in the article - you have to loft a large ball (larger and firmer than a soccer ball) into a hole (technically "hoop", a horizontal metal rim, with a soft netting underneath that slows the descent) that's a bit bigger than that ball, without getting closer than 80 feet to the target.

For the sake of this discussion Michael Jordan is analogous to Pelé or Messi of football (soccer) fame.