Here's a breakdown:

* Double: DNA consists of two long strands of nucleotides, each spiraling around the other.

* Helix: These two strands are twisted together like a ladder, forming a helical shape.

Key features of the double helix:

* Nucleotides: Each strand is made up of nucleotides, which consist of a sugar (deoxyribose), a phosphate group, and one of four nitrogenous bases: adenine (A), guanine (G), cytosine (C), and thymine (T).

* Base pairing: The two strands are held together by hydrogen bonds between the bases. Adenine always pairs with thymine (A-T), and guanine always pairs with cytosine (G-C).

* Antiparallel: The two strands run in opposite directions (5' to 3' and 3' to 5'), creating a consistent structure.

Think of it like a twisted ladder:

* Rungs: The base pairs (A-T and G-C) form the rungs of the ladder.

* Sides: The sugar-phosphate backbones of each strand form the sides of the ladder.

This intricate structure allows DNA to store and transmit genetic information efficiently.