- Very popular open-source web server
- 15 years of active development
- On 120 million Internet servers (as of April 2010)
- 64.91% of all web servers as of January 2012
- By default has two main log files:
- Access log (logs all requests to the server)
- Error log (logs all requests that caused an error)
- Other types as well: ssl_access, ssl_error, etc.