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By default, many useful programs are already installed when you put Ubuntu onto your computer.
However, you may need a particular piece of software that serves a purpose not served by the default applications.
When you install software, thousands of files may be required just to let the program start!
When you think that they all have to be put in exactly the right location, and some of those files may need to be changed depending on what type of computer you have, it can all get very complicated. to store everything that a particular program needs to run.
Source code is written by programmers and is essentially a list of instructions to a computer which humans are able to read and write.