What is the function of IgnoreA and IgnoreB in Collider Kangaroo?

What is the function of IgnoreA and IgnoreB in Collider Kangaroo?3

The default behaviour of the collider is to detect collisions between all the objects input.
The IgnoreA/IgnoreB inputs let you exclude specific pairs from this.
There must be the same number of items in both lists, and pairs at matching indices in these lists are excepted from the collision detection.
For instance, here sphere 1 does not interact with spheres 2 or 5, but all other pairs collide as normal

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Thank you Daniel. Its really easy to understand the funtion with this video.