And what, Monks, is existence?

There are these three kinds of existence: sense‑sphere existence, form‑sphere existence, formless-sphere existence. This is called existence.

With the arising of clinging, there is the arising of existence; with the elimination of clinging, there is the elimination of existence.

Just this Noble Eight Fold Path is the way leading to the elimination of existence; that is, Right View, Right Intention, Right Speech, Right Action, Right Livelihood, Right Effort, Right Mindfulness, Right Concentration.

(Reference: SN 12.2)

In this Teaching from Gotama Buddha, he shares the three kinds of existence.

He explains how when the mind has clinging, there will be existence.

Clinging is how the unEnlightened mind wants to hold on. But this only leads to discontentedness and further existence in The Cycle of Rebirth. Through the elimination of clinging there is elimination of existence in The Cycle of Rebirth.

It is through learning, reflecting, and practicing The Eight Fold Path that leads to training the mind to eliminate clinging to eliminate existence in The Cycle of Rebirth.