What is the significance of the & and && operators in PL SQL ?

What is the significance of the & and && operators in PL SQL ?
The & operator means that the PL SQL block requires user input for a
variable. The && operator means that the value of this variable should be
the same as inputted by the user previously for this same variable.
If a transaction is very large, and the rollback segment is not able to hold
the rollback information, then will the transaction span across different
rollback segments or will it terminate ?
It will terminate (Please check ).

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