Difference between string and unstring

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STRING
UNSTRING
1.       It is used to merge two or more     variable into single variable.
2.       End-string.
3.       Pointer used in specify starting position in receive field.
4.       Multiple sending fields and one receive field.
5.       No (.) are allowed between and end-string.
1.       It is used to split single variable into multiple variable.
2.       End-unstring.
3.       Pointers used in specify starting position in sending field.
4.       Multiple receive fields and one sending files.
5.       NO (.) are allowed between and end-unstring.

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