Q.Answer in one sentence.
What is CAS?

A Computerised Accounting System (CAS) applies the same double-entry accounting principles a TS Inter II year Accountancy student already knows from manual bookkeeping, but records, processes and reports transactions with the help of a computer and accounting software rather than by hand. Businesses adopt CAS because it copes with a growing volume of transactions, delivers information quickly and accurately, and produces multiple ready reports from a single voucher entry — needs a purely manual system struggles to meet as a business grows. …