What is the difference between manual accounting and computerized accounting?

Manual accounting is how all accounting was done in the past, on physical paper, handwritten. If you sold an item, you had to physically create a receipt with paper and pen and then physically record it into a ledger for your accounting. As times have changed and technology has developed, a lot of financial processes are digitized. When your business has a financial transaction, it is automatically recorded in your computer system, and then imported into your accounting software for tracking. That is computerized accounting.