DNA is a double helix, meaning it has two strands that are twisted around each other. These strands are complementary to each other, meaning they pair up in a specific way.

The two strands are typically called:

* The leading strand: This is the strand that is synthesized continuously during DNA replication.

* The lagging strand: This strand is synthesized discontinuously in short fragments called Okazaki fragments.

It's important to remember that these terms are used in the context of DNA replication. They don't have any intrinsic meaning outside of this process.

Furthermore, when referring to the individual strands, it is more accurate to say:

* The 5' to 3' strand

* The 3' to 5' strand

This refers to the directionality of the strands, which is based on the numbering of the carbon atoms in the deoxyribose sugar.