Difference between chromatid and chromatin???

Chromatin is the complex of nucleic acids (DNA and RNA) and proteins (primarily histones), in the cell nucleus that stains readily with basic dyes and condenses to form chromosomes during cell division. is found inside the nuclei of eukaryotic cells, and within the nucleoid in prokaryotic cells. It is divided between heterochromatin (condensed) and euchromatin (extended) forms. The functions of chromatin are to package DNA into a smaller volume to fit in the cell, to strengthen the DNA to allow mitosis and meiosis, and to serve as a mechanism to control expression and DNA replication.
Chromatid is either of the two daughter strands of a replicated chromosome that are joined by a single centromere and separate during cell division to become individual chromosomes. The term is used so long as the centromeres remain in contact. When they separate (during anaphase of mitosis and anaphase 2 of meiosis), the strands are called daughter-chromosomes. In other words, a chromatid is 'one-half of a replicated chromosome'.