3D printing has made remarkable progress in recent years, revolutionizing the way we create prototypes, products, and complex designs that would not be possible with traditional manufacturing methods. In this article, we compare the two additive manufacturing technologies Selective Laser Sintering (SLS) and Fused Deposition Modeling (FDM), and look into their processes, applications, advantages, and limitations. all 3D printing technologies, especially SLS and FDM, will continue to drive innovation and expand their application areas. Future developments are expected to increase the already impressive performance of these methods and open up new horizons in the manufacturing industry