The PCD file format is a standardized data format specifically designed for storing three-dimensional point cloud data, which is commonly generated by 3D laser scanners, LiDAR devices, stereo cameras, and depth-sensing hardware. Unlike traditional 2D images, a PCD file contains a large collection of spatial coordinate points in a 3D coordinate system, typically represented by X, Y, and Z geometric values, alongside additional optional attributes such as RGB color information, intensity, normal vectors, and point labels. This format is heavily utilized in the fields of robotics, autonomous driving, computer vision, 3D geographic information systems (GIS), and heritage conservation for environmental mapping, 3D object recognition, and spatial modeling. The structure of a PCD file usually consists of an ASCII or binary header that defines the metadata—such as field names, data types, point counts, and dimensions—followed by the actual point data. Its flexibility and efficiency make it a critical format for processing large-scale spatial datasets in modern perception and visualization pipelines.