Interesting...
Data Compression - How is it done?

Here are two examples of data compression techniques - both of these are lossless compression algorithms...

 
[1] The text below...
the width of the bath is thirty cms. This text is 36 characters.
...can be compressed by replacing all instances of the combination of characters [th] by the character '@')
@e wid@ of @e ba@ is @irty cms. The text has been reduced to 31 characters.
There is no loss of data because the original text can be reproduced.
 
[2] Images or videos are stored as numbers that often include repeated data. Here is a small part of numerical data...
21 21 21 45 45 45 45 45 92 92 The data consists of 10 numbers.
Sequences of repeated numbers may be replaced by the repeating number and the count of how many there are...
3 21 5 45 2 92 The data has been reduced to 6 numbers.
Again, there is no loss of data as the original data can be reproduced.

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