What is Ubuntu Desktop made of?

ubuntu-desktop/explanation/what-ubuntu-is-made-from.md

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+# What is Ubuntu Desktop made of?
+
+Ubuntu Desktop has millions of users today. As a new user, you might be curious to know what Ubuntu Desktop is made of.
+Not necessarily a deep technical explanation, but a great overview of what it is. This is what this guide addresses.
+It explains what a desktop environment is, what applications are, how package managers work, and more.
+
+## Desktop environment
+
+The Ubuntu Desktop environment provides a Graphical User Interface (GUI) for interacting with Ubuntu.
+Think of it like a theme but with more in-depth customization. Several desktop environments exist, and some are memory-intensive and others aren't.
+Ubuntu Desktop ships with the GNOME desktop environment by default. Other alternative environments are:
+
+- KDE Plasma
+- XFCE
+- LXQt
+- MATE
+- Budgie, etc.
+
+Interestingly, Ubuntu Desktop comes in [different flavors](https://ubuntu.com/desktop/flavours), each with its desktop environment.
+For example, the Kubuntu flavor supports the KDE Plasma desktop environment.
+
+A desktop environment consists of different independent components that are customizable.
+Sometimes, a Linux user may choose to run only one component rather than the entire desktop environment to save memory. Anyway, some of these components are:
+
+- **Windows manager**: This manages a window that pops up when you open a terminal or any application at all.
+- **User app**: These are default applications in the desktop environment.
+- **File manager**: This is a UI environment for interacting with files.
+
+## Applications
+
+This comprises of system and user applications.
+
+- **System application**: The system applications interact with the operating system. Examples are App Center, Terminal, etc.
+- **User applications**: They perform day-to-day activities and have permissions to the operating system restricted. One example is Firefox.
+
+## Package manager
+
+A package manager is used to manage your application lifecycle; install, upgrade, remove, etc. You can do this using a GUI or command line.
+
+- **The GUI**: Ubuntu Desktop comes pre-installed with an application store called App Center or Snap Store. For example, you open it, search for an application, and install it.
+- **Command line**: This is the backend version of the GUI application store. It uses `apt` or `snap`, and the applications are downloaded from a repository; this may be one maintained by Canonical or a third party.
+  - **apt (Advanced Package Tool)**: This isn't Ubuntu-specific, but is used on all Debian-based systems like Ubuntu.
+  - **snap**: This is developed by Canonical.
+
+## Display server
+
+## Services
+
+## Shell
+
+## Kernel