Difference between Dim and Redim

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Dim :
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Dim is used to  declare the variables
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Redim : 
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 Redim Is used to re size the array variables
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Preserve :
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Preserve is the word we can preserve the last array values
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Example:

Dim a()

ReDim a(3)

a(0) = "1"

a(1) = "2"

a(2)= "3"


Redim preserve a(5)

a(3) = "14"

a(4) = "15"

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Note: if we are using redim statement with out preserve key, it will not preserve the previous array value & will creates fresh array
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