Introduction Biomaterials are among the fundamental pillars of biomedical engineering. They are natural or synthetic materials designed to interact with biological systems for therapeutic or diagnostic purposes, such as replacing damaged tissues and supporting organ functions. Their success depends on their ability to perform their intended functions safely and effectively within the human body. Main Types of Biomaterials Biomaterials are classified into several main categories, including metals, such as titanium and its alloys, which are used in joint replacements and dental implants; polymers, such as silicone and polylactic acid (PLA), which are used in certain surgical sutures and drug delivery systems; and ceramics, such as hydroxyapatite and zirconia, which are used in bone repair and restoration. Composite materials are also widely used, combining the properties of different materials to enhance performance. Properties and Medical Applications Biocompatibility is one of the most important requirements for biomaterials, alongside mechanical strength, corrosion resistance, surface properties, and, in some cases, biodegradability. These materials are used in artificial joints, vascular stents, dental implants, and tissue engineering. In tissue engineering, three-dimensional scaffolds provide a supportive environment for cell growth and tissue regeneration. Challenges and Future Prospects The main challenges include reducing inflammation, corrosion, and mechanical failure while ensuring long-term safety. Current research is increasingly focused on smart biomaterials, nanostructured surfaces, and three-dimensional printing to develop implants that better meet individual patient needs. However, their safety and effectiveness must be thoroughly evaluated before clinical application. Conclusion The integration of materials science, engineering, and medicine contributes to the development of more efficient biomaterials. This interdisciplinary approach supports advances in medical devices, reconstructive treatments, and regenerative medicine, ultimately improving the quality of healthcare and patient outcomes.