Fault tolerance is the property that keeps a system operating properly in the event of a failure of one of the components within the system
A fault tolerant system enables the system to continue its operation possibly at a reduced level, rather than having the whole system breakdown.
A good security expert understands the need for fault tolerance in a comprehensive security system, as the absence of this can lead to serious security breaches once the whole system is down.
An optical character recognition software can be used to convert digitized documents into ascii (american standard code for information interchange) text that can be edited by word processing software.