Here's a breakdown:

* Chromosomes: These are long, thread-like structures found in the nucleus of most living cells. They are made up of tightly coiled DNA and proteins.

* DNA: This is a complex molecule that contains the genetic instructions for building and maintaining an organism. It's a double helix structure, like a twisted ladder, with two strands held together by chemical bonds.

* Genes: These are segments of DNA that code for specific traits or characteristics. Each gene has a unique sequence of nucleotides (building blocks of DNA) that determines its function.

So, to summarize: chromosomes are made of DNA, and genes are specific sections within that DNA.