<p>3D printing has revolutionized many industries through its ability to manufacture complex shapes with accuracy and efficiency. The present review paper discusses the numerous materials, processes, and applications of 3D printing technologies providing a comprehensive overview on their progress and challenges and covers the general methodologies for 3D printing. Key materials used in 3D printing such as metals, ceramics, thermoplastics and bio-based materials are explained regarding their properties and the intended area for using. Extrusion-based, liquid-resin-based and laser-sintered methods are merely some of the main divisions where 3D printing technologies are classified into parties in this research. This growing concern with optimizing the printing parameters - such as layer thickness, speed of print and temperature to improve product quality is also noted in previous studies on 3D printing processes. In recent years 3D printing has also integrated AI for optimizing printing, defect recognition and process control. The value of the 3DP articles produced for practical applications lies in the characterization of printed components, including their mechanical performance and microstructural examination and discussed numerous applications of such technology to aerospace, automotive, healthcare as well as architecture and fashion. This review provides valuable information for the academicians, researchers, scientists or physicians who seek to improve potential and applications of 3d printing technology.</p>