diff --git a/glossary/Application.md b/glossary/Application.md
index 94097e0b7..4a9780e60 100644
--- a/glossary/Application.md
+++ b/glossary/Application.md
@@ -1,5 +1,6 @@
 # Application
 An application is a standalone piece of software. They can be launched individually or turned into Compose Modules.
+A special type of application is the [Compose Applicaction](ComposeApplication.md).
 
 ## Examples
  - Notepad.exe
diff --git a/glossary/ComposeApplication.md b/glossary/ComposeApplication.md
new file mode 100644
index 000000000..b56d91ea5
--- /dev/null
+++ b/glossary/ComposeApplication.md
@@ -0,0 +1,3 @@
+# Compose Application
+A Compose Application is an executable that hosts the ComposeUI infrastructure and modules. The responsibilities of a Compose Application are creating and starting the core ComposeUI components such as the MessageRouter and the ModuleLoader, presenting a Shell to the user and providing a module manifest to these components listing the modules available to load.
+While the core ComposeUI components are hosted within the main Compose Application process, modules are loaded into separate processes.
\ No newline at end of file