Microneedles are tiny, needle-like structures that are typically less than a millimeter in length. They are designed to penetrate the outer layer of the skin, allowing for the delivery of medications, vaccines, or other therapeutic agents directly into the body. This method can enhance the effectiveness of treatments while minimizing pain and discomfort compared to traditional injections. These devices can be made from various materials, including silicon, polymers, or metals, and can be used in various applications, such as vaccination, drug delivery, and cosmetic treatments. Microneedles are often incorporated into patches or devices that can be easily applied to the skin, making them a promising alternative to conventional methods.