A dendrimer is an extremely small molecule whose diameter is on the order of nanometers. It has a tree-like branched structure and can be used to carry small particles. Thus, dendrimers can act as nanoscale vehicles for targeted drug delivery, binding to and shuttling individual drug molecules to a desired location in the body. The chemical bond between dendrimers and the molecules they carry can only be broken under specific conditions or when receptors on the dendrimer are activated, allowing drugs to only be delivered to a specific area. This process also ensures that the efficacy of the drug is maximized, as molecules are not lost or chemically affected while passing through the bloodstream.