What is the role of dna in transmitting genetic information? describe dna’s important genetic role in a few sentences below.

DNA is the molecule which holds the Genetic Information , it's like the blueprint for how the body will be built, you can call it the book of life. 

DNA is like a book written in a 4-letters-language, each three letter (Codon) can form a word , and these words can form sentences (Genes). And like any other type of sentences they contain some words which are not necessary (Introns) and crucial words (Exons). Moreover like any book, some chapters are not that necessary (Noncoding DNA).