Validation is used to check data to make sure it fits whatever required specifications are set for it. Typically Validation is used in checking input data, and in verifying data before storage.

An endpoint of a bi-directional inter-process communication flow. This often refers to a process flow over a network connection, but by no means is limited to such. Not to be confused with WebSocket (a protocol) or other abstractions (e.g. socket.io).

UITableView is a class used for displaying and editing lists of information on iOS. A table view displays items in a single column. UITableView is a subclass of UIScrollView, which allows users to scroll through the table, although UITableView allows vertical scrolling only.

Go is an open-source programming language. It is statically-typed, with a syntax loosely derived from C, adding automatic memory management, type safety, some dynamic typing capabilities, additional built-in types such as variable-length arrays (called slices) and key-value maps, and a large standard library.

An object is any entity that can be manipulated by commands in a programming language. An object can be a value, a variable, a function, or a complex data-structure. In object-oriented programming, an object refers to an instance of a class.

Apache Cordova (formerly PhoneGap) is a framework that allows developers to create cross-platform mobile applications using web technologies like HTML, JavaScript, and CSS.

A "web service" is a software system designed to support interoperable machine-to-machine interaction over the World Wide Web.

Extensible Application Markup Language (XAML) is a declarative XML-based language used for initializing structured values and objects in various frameworks. When a question is about the usage of XAML with a specific framework a tag for the framework should also be provided e.g. [wpf] (Windows Presentation Foundation), [silverlight], [windows-phone], [windows-store-apps] (Windows 8 store apps), [win-universal-app], [xamarin.forms] or [workflow-foundation]

Object-oriented programming is a programming paradigm using "objects": an encapsulation consisting of data fields and methods together with their interactions.

A layout defines the visual structure for a user interface, such as the UI for an activity, fragment or app widget.

Use this tag for questions involving code to send or receive email messages. Posting to ask why the emails you send are marked as spam is off-topic for Stack Overflow. Questions about configuration of mail servers belong on Server Fault.