In this paper, the current trends of technologies to represent 3D point clouds and its use cases are overviewed. The use of 3D point clouds have been increasing, and efficient representation of 3D point clouds are needed. Mesh coding after surface fitting has been one of the major approaches for point cloud compression, and compression exploiting the correlation after simplifying the original point cloud is also becoming a major approach in recent years. A standardization activity for 3D point cloud compression is ongoing under MPEG. A call for proposals on new coding tools for 3D point cloud compression has been issued in January, 2017, and it is planned to finalize the standardization in April, 2019.