Double-stranded DNA (dsDNA) is a molecule that carries genetic information in living organisms. It consists of two long strands that twist around each other to form a double helix. Each strand is made up of nucleotides, which are the building blocks of DNA. The sequence of these nucleotides encodes the instructions needed for the development and functioning of all known life forms. In dsDNA, the strands are held together by base pairs, where specific nucleotides pair up: adenine (A) with thymine (T) and cytosine (C) with guanine (G). This pairing is crucial for processes like DNA replication and protein synthesis, ensuring that genetic information is accurately copied and expressed in cells.