There are two halves to this. 'Encode' and 'Decode'.
You 'encode' data by applying a set of rules to convert it to another form.
For example, there is an ASCII standard to 'encode' letters of the alphabet into a set of binary numbers.
On the other hand, there is a set of rules to 'decode' these binary numbers back into alphabet letters.
The purpose of Encoding and Decoding is to allow the information to be transmitted in a convenient form. For example, video signals are 'encoded' and 'decoded' using some standard protocol. These protocols are called 'CODECS' which is a short word for COde-DECode
There are many codecs and you must have the right one installed on your computer in order to view the video.
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Codec