Rust is a systems programming language without a garbage collector focused on three goals: safety, speed, and concurrency. Use this tag for questions about code written in Rust. Use an edition specific tag for questions that refer to code which requires a particular edition, like [rust-2018]. Use more specific tags for subtopics like [rust-cargo] and [rust-macros].

Model-View-ViewModel (MVVM) is an architectural design pattern for implementing user interfaces that separates the UI (the View) from its data (the Model) via its presentation logic (its ViewModel).

Questions about creating or managing Activities in Android. In Android Applications, an Activity is a Component that provides a user interface allowing the user to do something. Simple examples are: dial the phone, take a photo, send an email, or view a map.

A keyword in various programming languages whose syntax is similar to or derived from C (C++, C#, Swift, Go, Rust, etc.). Use a specific programming language tag to tag questions involving use of a `struct` as syntax and semantics can be language dependent. Keyword defines or declares a data type composed of other data types. Each member of a struct has its own area of memory (as opposed to a `union` whose members share a single area of memory).

Core Data is Apple's object modeling and persistence framework for iOS, iPadOS, tvOS, watchOS, and macOS. Xcode provides an object model editor for specifying entities, attributes, and relationships.

Groovy is an object-oriented programming language for the Java platform. It is a dynamic language with features similar to those of Python, Ruby, Perl and Smalltalk. It can be used as a scripting language for the Java platform.

Measuring the time it takes to perform an operation. Also, questions related to obtaining the current time, calculating on times, formatting and parsing times, etc.

GENERAL SSH SUPPORT IS OFF-TOPIC. Support questions may be asked on https://superuser.com. Secure Shell (SSH) is a cryptographic network protocol for secure data communication. Use this tag for programming questions related to Secure Shell. Common authentication and configuration problems are off-topic for Stack Overflow.

The RecyclerView widget is a more advanced and flexible version of ListView and GridView.

Active Record is a pattern that combines domain logic with storage abstraction in single object. Use this tag for questions about the pattern, [rails-activerecord] for questions about the Rails ORM framework.

DO NOT USE FOR THE AWS SERVICE (use [aws-lambda] for those questions!) Lambdas are anonymous functions or closures in programming languages such as Lisp, C#, C++, Lua, Python, Ruby, JavaScript, or Java. (Also, lambda expression.)