Answer Posted / i.srikanth

Structures (structured types)
Structured types describe the structure and functions of any
structured data objects, that is of data structures with
components of any type.
A component can be a field with an elementary type or can
itself be a structure. A table can also be used as a
component in a structure.
A database table always has a structure and is therefore
implicitly a structured type. However, the fields of a
database table can only have an elementary type.

Table types
Table types describe the structure and functions of internal
tables in the ABAP program. Their rows can have any row
type. Table types with elementary row type therefore can be
defined just the same as multi-dimensional table types
(table types with a table type as row type) or table types
using structures with table-like components.

In a simple words,
Structure is just a flat structure but Table type is an
internal table.

Sample code how to use them to create internal table:
* Create Internal table from a structure:
DATA: IT_DATA TYPE STANDART TABLE OF Structure.

* Create Internal table from a table type:
DATA: IT_DATA TYPE table_type.

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