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technology/systems/Android.md

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+---
+website: https://www.android.com
+obj: os
+---
+
+# Android
+Android is a mobile operating system developed by Google. It is based on the [Linux](../linux/Linux.md) kernel and is designed primarily for touchscreen devices such as smartphones and tablets. [GrapheneOS](GrapheneOS.md) is a custom Android ROM focused on Security.
+
+## Architecture and Components:
+### 1. **Linux Kernel:**
+- Android's foundation lies in the [Linux](../linux/Linux.md) kernel, which provides a secure and reliable core for the operating system.
+### 2. **Android Runtime (ART):**
+- Android utilizes the ART runtime to execute applications, offering improved performance and responsiveness compared to its predecessor, Dalvik.
+### 3. **Application Framework:**
+- Developers leverage the Android application framework, a set of APIs that includes activities, services, content providers, and broadcast receivers, to build diverse and interactive applications.
+### 4. **Libraries:**
+- Android includes various libraries for tasks such as graphics rendering, database access, and network communication, simplifying the development process and enhancing application capabilities.
+### 5. **Application Layer:**
+- The application layer is where users interact with installed applications, spanning a wide range of categories from productivity to entertainment.

technology/systems/GrapheneOS.md

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+---
+obj: os
+website: https://grapheneos.org
+---
+
+# GrapheneOS
+GrapheneOS is a privacy and security focused mobile OS with [Android](Android.md) app compatibility developed as a non-profit open source project. It's focused on the research and development of privacy and security technology including substantial improvements to sandboxing, exploit mitigations and the permission model.
+
+GrapheneOS is designed to work on Google Pixel devices, offering a secure and privacy-focused alternative to the stock [Android](Android.md) experience.