This document discusses Osmium, a C++ library for efficiently manipulating and working with large OpenStreetMap data. Osmium allows streaming through data piece by piece and includes features like basic OSM objects, input/output in different formats, geometry processing, and handler classes. It aims to be fast, flexible, and work with data from the entire planet. The document outlines Osmium's history and development, including a new version focused on modern C++, multithreading, and object storage. It provides examples of using Osmium and directs readers to additional resources.