YouTube is a video-sharing website on which users can upload, share, and view videos. StackOverflow questions tagged with "youtube" should be about specific programming problems, software tools, or libraries. If your question is about the YouTube API, the "youtube-api" tag should also be added.

A set of interrelated operations that must all succeed in order for any of them to succeed. Failure of any operation results in a rollback of all operations in the transaction.

A notification is a user interface element displayed to indicate an event has occurred.

Null means *nothing* or *unknown*, depending on context. Please use the "sql-null" tag for SQL specific questions.

This tag relates to any of various nested entities or operations in programming.

Active Directory (AD) is a distributed directory service created by Microsoft. It stores all information and settings for a deployment in a central database. AD allows administrators to assign policies, deploy and update software. AD networks can vary from a small installation with a few computers, users and printers to tens of thousands of users, many different network domains and large server farms spanning many geographical sites.

Apache Ant (formerly Jakarta Ant) is a declarative, XML-based build tool created originally for Java projects. It provides a rich set of standard tasks for performing most common build operations, such as compiling Java source, building archives and running tests. Ant's functionality can be extended through custom tasks and macros.

Google Cloud Functions is a lightweight, event-based, asynchronous compute solution that allows you to create small, single-purpose functions written in Node.js, Python or Go that respond to cloud events without the need to manage a server or a runtime environment.

OpenSSL is an open source software toolkit that implements the SSL/TLS protocol, as well as a general cryptographic library.

Yii 2 is the latest version of the Yii framework - a high-performance, component-based PHP framework

The Standard Template Library, or STL, is a C++ library of generic containers, iterators, algorithms, and function objects. When C++ was standardised, large parts of the STL were adopted into the Standard Library, and these parts in the Standard Library are also sometimes erroneously referred to collectively as "the STL".