Here's why:

* Chromatin is a complex of DNA and proteins (primarily histones) that makes up chromosomes. It's a loose, thread-like structure, allowing for easy access to the DNA for processes like replication and transcription.

* Chromosomes are the condensed, tightly coiled structures of DNA that are visible during cell division (mitosis and meiosis).

Interphase is the stage of the cell cycle where the cell grows and replicates its DNA. Since the cell needs to access the DNA for these processes, it remains in its decondensed chromatin form.