Docker provides a high-level API to containerize processes and applications with some degree of isolation and repeatability across servers. Docker supports both Linux and Windows containers.
Android is Google's mobile operating system, used for programming or developing digital devices (Smartphones, Tablets, Automobiles, TVs, Wear, Glass, IoT). For topics related to Android, use Android-specific tags such as android-intent, not intent, android-activity, not activity, android-adapter, not adapter etc. For questions other than development or programming, but related to Android framework, use the link: https://android.stackexchange.com.
Do not use this tag. For questions related to an aspect of the world wide web, use a more specific tag for it, such as [uri], [html], [http] or [w3c].
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This tag is for programming-specific questions related to the content management system WordPress. Questions about theme development, WordPress administration, management best practices, and server configuration are off-topic here and best asked on Stack Exchange WordPress Development.
LINUX QUESTIONS MUST BE PROGRAMMING RELATED. Use this tag only if your question relates to programming using Linux APIs or Linux-specific behavior, not just because you happen to run your code on Linux. If you need Linux support you can try https://unix.stackexchange.com or https://askubuntu.com
Use this tag (along with an appropriate programming-language tag) for programming questions relating to the Apache HTTP Server. Do not use this tag for questions about other Apache Foundation products. Note that server configuration questions are usually a better fit on https://serverfault.com
PHP is a widely used, high-level, dynamic, object-oriented and interpreted scripting language primarily designed for server-side web development.
MongoDB is a scalable, high-performance, open source, document-oriented NoSQL database. It supports a large number of languages and application development platforms. Questions about server administration can be asked on http://dba.stackexchange.com.
WebSocket is an API built on top of TCP sockets and a protocol for bi-directional, full-duplex communication between client and server without the overhead of HTTP.