What are the definitions and purposes of a cash book and how can computers be useful to business owners?

Here are the answers to your questions:

2. A cash book is a primary accounting record used to record all cash receipts and cash payments. Its purpose is to track the flow of cash in and out of a business, providing a detailed record of cash transactions and helping to manage liquidity.

3. Computers are useful to business owners for various reasons, including streamlining operations through automation, improving data management for better decision-making, facilitating communication and marketing, and enhancing financial record-keeping and analysis.