Bond length refers to the distance between the nuclei of two atoms that are bonded together in a molecule. It is a crucial factor in determining the strength and stability of a chemical bond. Generally, shorter bond lengths indicate stronger bonds, while longer bond lengths suggest weaker interactions. Different types of bonds, such as single, double, and triple bonds, have varying bond lengths. For example, a single bond, like that found in ethane, has a longer bond length compared to a double bond, such as in ethylene. Factors like atomic size and electronegativity also influence bond lengths.