what is the difference between biological samples and biological products in cryogenic preservation?

Answer 1

The obvious answer is that the cryogenically frozen samples are stored at very low temperatures where biological activity and degradation do not occur. But your question is more complex than it appears on the surface. In theory cryogenic preservation simply freezes (no pun intended) cells at a specific point, and it should be possible to thaw them carefully and have them resume normal activity. This works well in some cases, particularly for bacteria. But the more complex the tissue being frozen, the more difficult it is to revive.