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memory allocation has two types : static and dynamic
1) the static are for the data types that will never change in size during the program execution suxh as integers (1 and 1000 will take the same size if we declare them to have the same type).
2) while another data types such as arrays and lists , will grow and shrink during execution time (due to the addition and removing) .
the HEAP is the part of the memory where such data (in part 2) are allocated.
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