What does "Bittul Chametz" refer to in Halacha during Passover?

Bittul Chametz refers specifically to the process of nullifying any leavened products (chametz) that one may own before Passover begins. This practice is vital in Halacha, as Jewish law prohibits the possession and consumption of chametz during the holiday. Bittul involves declaring that any chametz in one’s possession is considered as if it is not theirs at all, effectively rendering it null and void from a Halachic perspective.

This act can be performed verbally, usually stating that any chametz that remains in one's household is ownerless. It is a critical component of Passover preparations, ensuring that even if any leavened products were inadvertently overlooked during the thorough cleaning and removal of chametz, they are still treated as if they do not exist in terms of ownership or liability.

Other options touch on related aspects of the treatment of chametz but do not define what Bittul Chametz fundamentally entails. For example, the storage of leavened products and the sale to non-Jews are practices associated with managing chametz, while consumption of chametz is more about what one does with it before the holiday rather than nullifying ownership. Thus, only the nullification perfectly captures the essence of Bittul Cham