Videos
IGCSE Computer Science
Pick a topic to watch.
10 video lessons
21:16
Why Computers Use Binary
Inside a processor there are billions of tiny switches. Each one can only be on, or off. That is all a c…
10:56
Data Transmission
You send a photo to a friend on the other side of the world. It does not travel as one lump. It is chopp…
18:08
The CPU
The processor in your phone is doing something almost stupidly simple. Fetch one instruction. Work out w…
13:11
Hardware & Software
Here is a brand new computer. Every physical part works — the processor, the memory, the screen, the key…
9:52
The Internet & the Web
You type a web address and press enter. Less than a second later, a page appears — a page that lives on …
10:22
Automated Systems
Picture a greenhouse at three in the morning. Nobody is there. The air warms up a little, and a window s…
9:17
The Program Development Life Cycle
Every app on your phone was written by someone like this. But they did not start by typing code. Before …
13:16
Programming
Here is a short program. It reads five test marks and prints the total. The five marks are eight, nine, …
8:17
Databases
Before computers, a library kept a drawer like this. One card per book, each holding the same few facts,…
8:37
Boolean Logic
Look closely at this chip. There is nothing clever inside it. It cannot think. Inside are millions of ti…