Holding multiple values in a given time in Visual Basic

Hi!

I would like to ask for your proper guidance. Can you show me how to declare array? What is array by the way? How to implement it in a simple program? What is the meaning and use of index in array? Can you show me how to create a simple program that will utilize the function of array? What are the objects we need to include in the form? Can you explain to me the syntaxes or commands that are included in the program?

Thank you very much!