Dendrimers are highly branched, tree-like molecules that have a central core and multiple layers of repeating units called "branches." These structures are typically made from synthetic polymers and can be designed to have specific chemical properties, making them useful in various applications, including drug delivery and nanotechnology. Due to their unique architecture, dendrimers can encapsulate other molecules, allowing them to transport drugs directly to targeted cells. Their size and shape can be precisely controlled, which enhances their effectiveness in medical treatments and diagnostics, as well as in materials science and nanotechnology.