What is the difference between recovery and restoring of the database

Restore is the process in which physical files are copied from backup to required location.
Recovery is the process of making the copied datafiles up to date with the help of archive redo log files.

Why more redo logs are generated when the database is in begin backup mode

To protect from fractured block corruption during begin backup mode oracle copies the whole block into redo record , So the size if redo increases . In this context more redo is generated