What are the important of computerization?

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Basically a computer is the tool you use to do the computerization.

Definition of computer:

com·put·er
noun
an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.
synonyms: personal computer, PC, laptop, netbook, ultraportable, desktop, terminal; More
a person who makes calculations, especially with a calculating machine.

Definition of computerization:

"1. to control, perform, process, or store (a system, operation, or information) by means of or in an electronic computer or computers. 2. to equip with or automate by computers: to computerize a business. verb (used without object), computerized, computerizing.

Computerization | Define Computerization at Dictionary.com