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# Fuchsia is not Linux
_A modular, capability-based operating system_
This document is a collection of articles describing the Fuchsia operating system,
organized around particular subsystems. Sections will be populated over time.
[TOC]
## Zircon Kernel
Zircon is the microkernel underlying the rest of Fuchsia. Zircon
also provides core drivers and Fuchsia's libc implementation.
- [Concepts][zircon-concepts]
- [System Calls][zircon-syscalls]
- [vDSO (libzircon)][zircon-vdso]
## Zircon Core
- Device Manager & Device Hosts
- [Device Driver Model (DDK)][zircon-ddk]
- [C Library (libc)](/docs/concepts/system/libc.md)
- [POSIX I/O (libfdio)](/docs/concepts/system/life_of_an_open.md)
- [Process Creation](/docs/concepts/booting/process_creation.md)
## Framework
- [Core Libraries](/docs/concepts/framework/core_libraries.md)
- Application model
- [Interface definition language (FIDL)][FIDL]
- Services
- Environments
- [Boot sequence](/docs/concepts/framework/boot_sequence.md)
- [Components][framework-components]
- Sessions
- [Namespaces](/docs/concepts/framework/namespaces.md)
- [Sandboxing](/docs/concepts/framework/sandboxing.md)
## Storage
- [Block devices](/docs/concepts/storage/block_devices.md)
- [File systems](/docs/concepts/filesystems/filesystems.md)
- Directory hierarchy
- [Ledger][ledger]
- Document store
- Application cache
## Networking
- Ethernet
- [Wireless](/docs/concepts/networking/wireless_networking.md)
- [Bluetooth](/docs/concepts/networking/bluetooth_architecture.md)
- [Telephony][telephony]
- Sockets
- HTTP
## Graphics
- [UI Overview][ui-overview]
- [Magma (vulkan driver)][magma]
- [Escher (physically-based renderer)][escher]
- [Scenic (compositor)][scenic]
- [Input manager][input-manager]
- [Flutter (UI toolkit)][flutter]
## Components
- [Component framework][framework-components]
## Media
- Audio
- Video
- DRM
## Backwards compatibility
- POSIX lite (what subset of POSIX we support and why)
- Web runtime
## Update and recovery
- [Software Update System][software-update-system]
- Verified boot
- Updater
## USB
- [USB Request Life cycle][request-life-cycle]
- [USB mass storage driver](/docs/concepts/usb/usb-mass-storage.md)
- [Testing][usb-testing]
- [Getting descriptors and endpoints][descriptors]
[zircon-concepts]: /docs/concepts/kernel/concepts.md
[zircon-syscalls]: /docs/reference/syscalls/README.md
[zircon-vdso]: /docs/concepts/kernel/vdso.md
[zircon-ddk]: /docs/concepts/drivers/overview.md
[FIDL]: /docs/development/languages/fidl/README.md
[framework-components]: /docs/concepts/components/README.md
[ledger]: /src/ledger/docs/README.md
[bluetooth]: /garnet/bin/bluetooth/README.md
[telephony]: /src/connectivity/telephony/
[magma]: /docs/concepts/graphics/magma/README.md
[escher]: /docs/concepts/graphics/escher/README.md
[ui-overview]: /docs/concepts/graphics/scenic/README.md
[scenic]: /docs/concepts/graphics/scenic/scenic.md
[input-manager]: /docs/concepts/graphics/scenic/input.md
[flutter]: https://flutter.dev/
[software-update-system]: /docs/concepts/system/software_update_system.md
[request-life-cycle]: /docs/concepts/usb/request-lifecycle.md
[usb-testing]: /docs/concepts/usb/testing.md
[descriptors]: /docs/development/drivers/usb/getting_descriptors_and_endpoints.md