# API Reference

This section is a reference guide for the _NNG_ programming interfaces.
It is meant to serve as a refernce, rather than as a tutorial.

The material here is organized by major areas of functionality.

Note that unless indicated otherwise, consumers of these interfaces must
include the `nng/nng.h` header file like so:

```c
#include <nng/nng.h>
```

## Chapters

- [Messages](msg/)
- [Threading and Synchronization](thr/)
- [Logging](logging.md)
- [Utility Functions](util/)