The Java exception thrown when an application attempts to use null in a case where an object is required.

This tag is for questions related to querying and updating MongoDB collections, either through the mongo shell or using a programming language driver.

grep is a command-line text-search utility originally written for Unix. It uses regular expressions to match text, and is commonly used as a filter in pipelines. Use this tag only if your question relates to programming using grep or grep-based APIs. Questions relating to using or troubleshooting grep command-line options itself are off-topic.

A graphical user interface element that presents a tabular view of data.

This tag refers to the Visual Studio line of software development products from Microsoft, the 2008 version. Do not use this tag unless you have a specific question about Visual Studio -- not just a coding issue. Questions should be specific to the 2008 version of Visual Studio.

Web Forms is a part of the ASP.NET web framework. It is one of the programming models you can use to create web applications. Web Forms are pages that users request through their browsers and that form the user interface (UI) that gives web applications their look and feel.

ASP.NET MVC 5 is the fifth major version of the ASP.NET Model-View-Controller platform for web applications.

a subclass of AdapterView which shows items in a vertically scrolling list.

A menu is a user interface mechanism that provides the user a means to view and execute application operations. (Generic; please use platform and/or language tags when possible instead)

Data structure for encoding pictures as a set of bits, in which each image pixel is mapped to a bit or a group of bit. Also used for encoding other complex data where each elementary information is mapped to bits, in a similar fashion. For platform specific bitmap API, prefer more specific tags (e.g. android-bitmap or nsbitmapimagerep).

Jackson is a Java library for handling tasks like reading and writing (parsing / generating) and data binding to/from Java objects. Although primarily used for JSON, Jackson also supports many other data formats such as Avro, CBOR, CSV, Java Properties, Protobuf, Smile, XML and YAML.