Free-style are the ones as used till PI 7.0 e.g. string, integer. SAP provides some standard datatypes which is accepted across the businesses. For such cases, some out of box datatypes are provided. These are called Core Components. Aggregate and Core datatypes are part of it. e.g. Address would be an aggregate datatype and any field of address like postal code could be a core datatype.
Free type data declaration is normal declaration like PI7.0, i.e., string etc. Core & aggregate data type are designed for business standard data type like data structure declaration globally, like address standard format.
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