In communication terms, a joint is a device that is installed between cables and has certain insulation and sealing properties, allowing two or more cables to run continuously.
In genetic engineering technology, two DNA molecules or two ends of a DNA molecule can be paired by enzyme cleavage and then covalently linked by ligase.
Synthetic hexamer linkers (containing a nick of a specific enzyme) are commonly used, or multiple hexamer linkers can be connected together to form a polylinker.