# Glossary > For the complete documentation index, see [llms.txt](https://plugins.jetbrains.com/docs/intellij/llms.txt). See also [Oracle's Java Technology Glossary](https://www.oracle.com/java/technologies/glossary.html). ## A Abstract Syntax Tree (AST) : The [Abstract Syntax Tree](implementing-parser-and-psi.html) represents the structure of source input files. : : : → [Program Structure Interface](#program-structure-interface) Annotator : Provides [semantic highlighting](syntax-highlighting-and-error-highlighting.html) based on underlying → [Program Structure Interface](#program-structure-interface) elements. : : : → [Inspection](#inspection) ## B Blocking Context : Executing in the [Blocking Context](execution-contexts.html#blocking-context) means executing tasks on a thread without access to a coroutine context. : : : → [Suspending Context](#suspending-context) : : : → [Coroutine Execution Context](#coroutine-execution-context) : : : → [Coroutine Scope](#coroutine-scope) : : : → [Coroutine](#coroutine) ## C `CancellationException` (CE) : `java.util.concurrent.CancellationException`, `kotlin.coroutines.cancellation.CancellationException` (typealias in stdlib), `kotlinx.coroutines.CancellationException` (typealias in kotlinx-coroutines) : : : → [ProcessCanceledException](#processcanceledexception) Code Insight : Code insight is a common name used for auto-completion, inspections, intention actions, type inference, and other features related to the code analysis. Coroutine : A [Kotlin coroutines](kotlin-coroutines.html) execution unit allowing for handling concurrency and asynchronous tasks efficiently with a sequential/imperative code style. Coroutine Dispatcher : Part of the coroutine context. Determines a thread or a thread pool the corresponding coroutine is executed on. See [Coroutine Dispatchers](coroutine-dispatchers.html) for more details. : : : → [Coroutine](#coroutine) Coroutine Execution Context : Executing in the [Coroutine Execution Context](execution-contexts.html#blocking-context) means executing code (suspending or non-suspending/blocking) from a coroutine. Coroutine Scope : [Coroutine scopes](coroutine-scopes.html) define the lifetime of coroutines and ensure proper handling of coroutine cancellations and structured concurrency. : : : → [Coroutine](#coroutine) ## D Document Object Model (DOM) : [XML DOM API](xml-dom-api.html) abstracts working with XML files based on a custom semantic model. ## E Event Dispatch Thread (EDT) : The [Event Dispatch Thread](https://docs.oracle.com/javase/tutorial/uiswing/concurrency/dispatch.html) handles all Swing events. See also [Threading Model](threading-model.html) and [EDT Dispatcher](coroutine-dispatchers.html#edt-dispatcher). Extension Point (EP) : Most functionality is provided by [Using Extension Points](plugin-extensions.html) provided by the platform or plugins. Plugins can also [define their own](plugin-extension-points.html) to allow extensibility. External System (ES) : [External System Integration](external-system-integration.html) allows integrating external project management systems. ## F Feature Usage Statistics (FUS) : JetBrains internal API to track feature usage in the IDE. File Based Index (FBI) : [File Based Index](file-based-indexes.html) allows storing key-value information based on the project's files. ## G Gradle Build Script : A configuration file written in Kotlin (`build.gradle.kts`) or Groovy (`build.gradle`) that describes the build process and dependencies of a plugin. ## I Inspection : Supports configurable [semantic highlighting](code-inspections-and-intentions.html). : : : → [Annotator](#annotator) Intention : Provides an [automated fix](code-inspections-and-intentions.html) for commonly encountered code problems. ## L Language Server Protocol (LSP) : Communication standard between development tools and Language Servers, see [Language Server Protocol (LSP)](language-server-protocol.html). Local History (LVCS) : A builtin [→ Version Control System](#version-control-system) tracking all changes in the project [locally](https://www.jetbrains.com/help/idea/local-history.html). Look and Feel (LaF) : Defines the visual appearance and behavior of the user interface; see [Swing Tutorial](https://docs.oracle.com/javase/tutorial/uiswing/lookandfeel/index.html). ## J JetBrains Project System (JPS) : Represents the project model in [External Build](external-builder-api.html#accessing-project-model-and-configuration-from-external-build) process. JetBrains Runtime (JBR) : The [JetBrains Runtime](ide-development-instance.html#using-a-jetbrains-runtime-for-the-development-instance) is the default bundled runtime for all IntelliJ Platform-based IDEs by JetBrains. ## N Non-Blocking Read Action (NBRA) : A → [Read Action](#read-action) that is canceled by a → [Write Action](#write-action). See also [Non-Blocking Read Actions](threading-model.html#non-blocking-read-actions). ## P `ProcessCanceledException` (PCE) : [ProcessCanceledException](https://github.com/JetBrains/intellij-community/tree/idea/263.7307.200/platform/util/base/multiplatform/src/com/intellij/openapi/progress/ProcessCanceledException.kt) An exception indicating that the currently running operation was terminated and should finish as soon as possible. : : : → [CancellationException](#cancellationexception) Program Structure Interface (PSI) : The [Program Structure Interface](psi.html) represents a syntactic and semantic code model of the source input files. : : : → [Abstract Syntax Tree](#abstract-syntax-tree) : : : → [Stubs](#stubs) ## R Read Action (RA) : Allows accessing code-related data structures for reading purposes. See also [Threading Model](threading-model.html). : : : → [Non-Blocking Read Action](#non-blocking-read-action) : : : → [Write Action](#write-action) Run Configuration (RC) : A [Run Configuration](run-configurations.html) allows running external processes from within the IDE. ## S Structural Search and Replace (SSR) : Allows searching and replacing code by defining the structure of the searched code fragments, see [Structural Search and Replace Inspections](plugin-alternatives.html#structural-search-and-replace-inspections). Stubs : A subset of a → [Program Structure Interface](#program-structure-interface) tree in a binary serialized compact format, see [Stub Indexes](stub-indexes.html). Suspending Context : Executing in the [Suspending Context](execution-contexts.html#suspending-context-coroutines) means executing tasks in Kotlin coroutines. : : : → [Blocking Context](#blocking-context) : : : → [Coroutine Execution Context](#coroutine-execution-context) : : : → [Coroutine](#coroutine) Symbol : A semantic element in some model, e.g., language or framework model, see [Symbols](symbols.html). ## U Unified Abstract Syntax Tree (UAST) : An [abstraction layer](uast.html) on the → [Program Structure Interface](#program-structure-interface) of different JVM languages. ## V Version Control System (VCS) : The API for [Version Control System](vcs-integration-for-plugins.html) allows accessing builtin as well as adding custom implementations. Virtual File (VF) : A [Virtual File](virtual-file.html) represents a file in a → [Virtual File System](#virtual-file-system). Virtual File System (VFS) : A [Virtual File System](virtual-file-system.html) provides a unified API for working with files represented as → [Virtual File](#virtual-file). ## W Write Action (WA) : Allows accessing code-related data structures for writing purposes. See also [Threading Model](threading-model.html). : : : → [Read Action](#read-action) Write Allowing Read Action (WARA) : A coroutine → [Read Action](#read-action) that is canceled by an incoming → [Write Action](#write-action). See [Coroutine Read Actions API](coroutine-read-actions.html#coroutine-read-actions-api) for details. : : : → [Suspending Context](#suspending-context) : : : → [Coroutine](#coroutine) Write Blocking Read Action (WBRA) : A coroutine → [Read Action](#read-action) that blocks incoming → [Write Action](#write-action). See [Coroutine Read Actions API](coroutine-read-actions.html#coroutine-read-actions-api) for details. : : : → [Suspending Context](#suspending-context) : : : → [Coroutine](#coroutine) > **Note: Something missing?** > If a topic is not covered in the above sections, let us know via the Feedback widget displayed on the right, or [other channels](getting-help.html#problems-with-the-guide). > > > > Be specific about the topics and reasons for adding them and leave your email in case we need more details. Thanks for your feedback!