Microneedle technology is revolutionizing the biomedical field by providing a minimally invasive solution for drug delivery, biosensing, and various therapeutic applications. This chapter dives into the design, fabrication, and wide-ranging uses of microneedles. The different types of microneedles, such as solid, hollow, coated, and dissolvable, are discussed, and how each type serves unique medical purposes is explained. It is also explored how microneedles improve drug absorption through the skin, making them ideal for delivering medications, vaccines, and other biomolecules transdermally. Additionally, the combination of microneedles with biosensors is examined to enable real-time health monitoring and diagnostics. The chapter also covers important considerations like biocompatibility, patient comfort, and feedback of microneedle systems. Through case studies and the latest research, this chapter highlights the profound impact of microneedles on healthcare and their potential to significantly enhance medical practices. Finally, it is addressed the challenges in the field and potential future developments.