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This lesson reviewed the fundamentals of how web servers work and why Nginx is widely used in modern web architectures.
  • When you browse a website, your browser sends HTTP(S) requests to a web server. The server generates or proxies the requested content and returns it to the browser.
  • Nginx was designed as a high-performance alternative to legacy servers (for example, Apache or IIS). Its design goals—efficiency, high concurrency, and low memory usage—help explain its broad adoption.
  • Two main editions exist:
    • The open-source Nginx is freely available and widely used.
    • Nginx Plus is the commercial edition that adds enterprise features, advanced monitoring, and commercial support.
  • Nginx remains a market leader because of its event-driven, asynchronous architecture, which provides high concurrency with a low memory footprint. It’s commonly deployed as:
    • a static file server,
    • a reverse proxy,
    • a load balancer,
    • a TLS (SSL) terminator.

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Nginx editions at a glance

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How Nginx works (high level)

  • Nginx uses an event-driven, non-blocking architecture rather than one-thread-per-connection. This allows a small number of worker processes to handle many simultaneous connections efficiently.
  • For dynamic content, Nginx usually proxies requests to application servers (e.g., Node.js, Python WSGI, PHP-FPM). For static files, it serves content directly from disk.
  • As a reverse proxy and load balancer, Nginx can:
    • distribute traffic across backend servers,
    • terminate TLS so backends can run unencrypted,
    • cache responses and reduce load on origin servers.

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Common Nginx use cases

  • Static file hosting (images, CSS, JavaScript)
  • Reverse proxy in front of application servers
  • SSL/TLS termination and certificate management
  • Layer 7 load balancing with health checks and session persistence
  • Caching and request rate limiting
A presentation summary slide with a turquoise sidebar and four colorful numbered points. It lists takeaways about web servers and Nginx — its popularity, open-source and commercial variants, installation flexibility, and performance/use cases.
Tip: If you’re evaluating Nginx for production use, start with the open-source edition for learning and development, then consider Nginx Plus if you need enterprise-grade features and support. For authoritative documentation, see the official Nginx resources linked below.
That wraps up this lesson. Next, we’ll begin installing and configuring Nginx.

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