Nginx is a web server and reverse proxy software. It is also used as a load balancer, HTTP cache and a mail proxy server. It is open source and free, and is known for its high performance and stability. Nginx is designed to handle a large number of concurrent connections and can easily scale to meet the needs of a high-traffic website. It is used by some of the world's most popular websites, including Netflix, WordPress, and Dropbox.
The Apache HTTP Server is free and open-source cross-platform web server software, released under the terms of Apache License 2.0. Apache is developed and maintained by an open community of developers under the auspices of the Apache Software Foundation.
LiteSpeed Web Server (LSWS) is a proprietary and open source web server software. LiteSpeed's goal is to be a fast webserver with a low memory footprint. LSWS is developed by privately held LiteSpeed Technologies. The software uses the same configuration format as Apache HTTP Server and is compatible with most Apache features.
#4 IIS 
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Internet Information Services is an extensible web server created by Microsoft for use with the Windows NT family.
Apache HTTP Server is a widely-used open-source web server software. It handles and delivers web content, supporting numerous protocols and configurations to provide reliable and efficient website hosting. It supports multiple operating systems and is known for its robust security features, stability, and extensive modularity through plugins. It is a cornerstone in web infrastructure, facilitating the delivery of content to billions of users worldwide.
OpenResty is a web platform that aims to run server-side web app completely in the Nginx server, leveraging Nginx's event model to do non-blocking I/O not only with the HTTP clients, but also with remote backends like MySQL, PostgreSQL, Memcached, and Redis.
Google Web Server is a proprietary web server software that Google uses for its web infrastructure. GWS is used exclusively inside Google's ecosystem for website hosting.
Microsoft HTTPAPI 2.0 (MS-HTTPAPI) is a component of Microsoft IIS (Internet Information Services) that provides a lightweight, high-performance HTTP server for web applications. It supports various protocols and is designed for efficient handling of HTTP requests. This API is commonly used for developing scalable web services and applications. (218 characters) Microsoft HTTPAPI 2.
Tengine is an advanced, high-performance web server designed for large-scale applications, offering robust features and excellent scalability. It's built on top of the open-source nginx and is widely used for handling high-traffic websites and services. Known for its efficiency and flexibility, Tengine is particularly suited for complex web environments. It supports multiple operating systems and is optimized for performance and reliability.
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