DNA is deoxyribonucleic acid. That’s the chemical that is the basis of it. Think of this is the paper and ink that everything is written in. This chemical can form into long chains. So that “paper and ink” can be as long as you need it.
Chromosomes are the “books”. There are 46 chromosomes in a human cell. These chromosomes are individual long chains of molecules made up of the DNA.
Each of those chromosomes will have small sections that work together to form proteins. Those sections are the genes.
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