There are two main types of nucleic acids:

* Deoxyribonucleic acid (DNA): DNA is the genetic material found in all living organisms. It contains the instructions for building and maintaining an organism. DNA is a double-stranded molecule, shaped like a twisted ladder (double helix).

* Ribonucleic acid (RNA): RNA plays a crucial role in protein synthesis. It carries genetic information from DNA to the ribosomes, where proteins are made. RNA is typically single-stranded.

Both DNA and RNA are made up of chains of nucleotides. Each nucleotide consists of three parts:

* A sugar: Deoxyribose in DNA and ribose in RNA.

* A phosphate group: This gives nucleic acids their acidic properties.

* A nitrogenous base: There are five different bases: adenine (A), guanine (G), cytosine (C), thymine (T) in DNA, and uracil (U) in RNA.

These nucleotides link together in a specific order, creating the unique sequences that code for all the genetic information of an organism.