The Apache Web Server, commonly referred to as Apache , is cobweb server software renowned seeking playing a pivotal duty in the commencing broadening of the World Sizeable Web. In 2009 it became the ahead snare server software to pass beyond the 100 million website milestone. Apache was the chief practicable alternative to the Netscape Communications Corporation trap server (currently known as Oracle iPlanet Network Server), and has since evolved to rival other web servers in terms of functionality and performance. Typically Apache is hop to it on a Unix-like operating system.
Apache is developed and maintained by an unspoken for community of developers under the protection of the Apache Software Foundation. The application is elbow for a wide selection of operating systems, including Unix, GNU, FreeBSD, Linux, Solaris, Novell NetWare, AmigaOS, Mac OS X, Microsoft Windows, OS/2, TPF, and eComStation. Released impaired the Apache License, Apache is open-source software.
Since April 1996 Apache has been the most popular HTTP server software in use. As of May 2011 Apache was estimated to minister to 63% of all websites and 66% of the million busiest.
Features

Apache supports a breed of features, divers implemented as compiled modules which on the gist functionality. These can class from server-side programming lingo support to authentication schemes. Some conventional words interfaces buttress Perl, Python, Tcl, and PHP. In demand authentication modules take in mod_access, mod_auth, mod_grasp, and mod_auth_epitomize, the successor to mod_digest. A illustration of other features include SSL and TLS stick (mod_ssl), a factor module (mod_substitute), a URL rewriter (also known as a rewrite locomotive, implemented high mod_rewrite), custom log files (mod_log_config), and filtering reinforce (mod_include and mod_ext_filter).
Sought-after compression methods on Apache categorize the superficial height module, mod_gzip, implemented to improve with reduction of the size (weight) of entanglement pages served during the course of HTTP. ModSecurity is an uncommitted rise intrusion detection and ban locomotive for cobweb applications. Apache logs can be analyzed from one end to the other a snare browser using sprung scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows united Apache station to one's duty multitudinous unalike actual websites. Allowing for regarding pattern, one machine with united Apache installation could simultaneously be in the service of www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and constituents negotiation. It is also supported near disparate graphical user interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing contraption and supports FTP.

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Although the sheer cabal object of Apache is not to be the "fastest" trap server, Apache does play a joke on performance comparable to other "high-performance" trap servers. As contrasted with of implementing a individual architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which allow Apache to skip out in a process-based, composite (deal with and motif) or event-hybrid mode, to excel match the demands of each separate infrastructure. This implies that the choice of chasten MPM and the correct configuration is important. Where compromises in dispatch dire to be made, the design of Apache is to slash latency and advance throughput, associated to na‹vely handling more requests, consequently ensuring predictable and reliable processing of requests within judicious time-frames.
The Apache version considered by the Apache Fundamental as providing high-performance is the multi-threaded version which mixes the put to use of diverse processes and diverse threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads set up a trim outlay than processes), it does not match the performances of the event-based architecture provided via other servers, uniquely when they process events with a handful worker threads.
This dissimilarity can be without even trying explained on the aloft that undivided thread per union brings (as opposed to a twosome of wage-earner threads per CPU, each processing profuse connection events). Each thread needs to keep going its own stack, environs, and switching from one theme to another is also an priceless censure for CPUs.