---
title: "13-OS-intro"
aliases: 
tags: 
- cosc204
- lecture
---


# why learn OS
- security
- optimisation
- wierd bugs
- "crown of programming"
- understand hardware better
- embedded sys and IoT
- co-design of hardware and software

# what is an OS
![big picture diagram|400](https://i.imgur.com/9O1YR0p.png)
-  a program (also called OS kernel) loaded onto RAM first when pc is turned on
- OS kernel (in kernel space)