nodeJS, Ruby, PHP, Python

What is the difference between these languages

I am guessing nodeJS is more of a true server language, and the others are scritping langugaes

Is this correct

Which one would be most useful in cloud solutions

Thanks
Anthony LuciaAsked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
I don't know how popular NodeJS is.  NodeJS is used to create web servers, not use them.  It requires access to the file system and services of a machine much more than PHP or Python do.  You can't install it on things like shared hosting because it would allow you to gain access to other people's files.
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Dave BaldwinFixer of ProblemsCommented:
They are all scripting languages.  NodeJS is based on Google's javascript implementation.  However, it is less likely to be installed on a hosting server because it requires low level access to the underlying system.  PHP and Python are more likely and Ruby from what I've seen is only supported by a few hosts.

Usefulness depends on need.  Impossible to give a useful answer without knowing what is needed.
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Anthony LuciaAuthor Commented:
That is very helpful, but  what do you mena that nodeJS requires low level access to the server

I thought nodeJS as rather popular ?
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