Chametz un grains ko kehte hain jo paanch main cereals (wheat, barley, rye, oats, spelt) se bane aur pani ke contact me aakar ferment ho gaye ho. Passover ke dauran chametz khana ya rakhna mana hai. Bread, pasta, beer aur bakery items usually chametz hote hain. Isi wajah se Passover ke liye special certified alternatives use kiye jate hain. https://blog.koshercertifications.in/a-guide-to-know-the-kosher-for-passover-in-brief-kosher-certification/