Welcome to the MSDN forum.
Could you please describe your question in detail.
What is your programming language?
If you are using C++ language and you want to know some basic knowledge, you can refer to this page:
It shows you a tutorial of what is array and how to define array in progarmming language.
Anyway, if you can show us your programming language type and the details of what you want to know, I can redirect you to the right forum.
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Barry Wang [MSFT]
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