What are the differences between chromatin and chromatids?

Basis of differentiation

Chromatin

Chromatids

Definition

Chromatin is the readily stainable substance of a cell nucleus, consisting of DNA, RNA, and various proteins that form chromosomes during cell division

A chromatid is one of two genetically identical chromosome strands in which a chromosome splits longitudinally to prepare for cell division

Composition

Chromatin consists of DNA molecules wrapped around histone proteins, forming nucleosomes

Chromatids are replicated copies of a single chromosome that join together at the centrosome

Presence in cell cycle

Chromatin is present throughout the entire cell cycle, and uncoil to become less condensed following telophase

Chromatids are only present during the late stages of the cell cycle; they begin separating during metaphase and are at opposite poles of the cell during anaphase

Function 

Chromatin acts the template for gene expression and allows for the proper packaging and organization of DNA  (wrapped around histones)

Chromatids primarily function in the distribution of genetic material during cell division

Structure

When not dividing, chromatin exists as a filamentos and loose structure in the nucleus 

Chromatids consists of one DNA molecule that is tightly coiled and condensed