Reconstruction using 3D scanning has drawn a lot of interest from a variety of sectors. The subject of Computer-Aided Design (CAD) has witnessed an increase in possible applications due to the growing popularity of 3D scanning technology. One such application is Reverse Engineering (RE), which involves reconstructing digital geometric models of physical items. This paper contrasts and evaluates three critical 3D scanning techniques: LiDAR, photogrammetry, and Coordinate Measuring Machines (CMMs). LiDAR uses laser light to measure distances and build comprehensive 3D point clouds; photogrammetry uses several images to assemble a 3D model; and CMMs are contact-based scanners that physically touch the object to obtain its dimensions. The primary focus of this study is to give a broad overview of the 3D scanning procedure and to determine how well these three scanning methods above mentioned perform in terms of resolution, accuracy, and applicability for various uses. The numerous applications of 3D scanning in mechanical engineering, including reverse engineering, quality control, wear assessment, and dimensional measurement, have also been examined. Additionally, the article points out the efficacy of 3D scanning in the field of medical engineering, where it is used to replicate and characterize body structures, as well as in the manufacturing sector.