...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
The phrase “index of” is a search operator used to find directories on web servers that have directory listing (indexing) enabled. When successful, such a search reveals a page listing all files within a folder — often allowing direct download of movies, music, or software without navigating a website interface.