A chromosome is a linear DNA molecule that contains part or all of an organism's genetic material.
Histones are packing proteins found in most eukaryotic chromosomes that, with the help of chaperone proteins, attach to and compress the DNA molecule to protect its integrity.
During cell division, chromosomal condensation occurs.
It is a drastic reorganization of long thin chromatin strands into compact short chromosomes.
The formed chromosomes after condensation are called condensed chromosomes.