A more thorough explanation:

Definition: Books of account are records of original entry maintained in the usual course of business by a shopkeeper, trader, or other businessperson. They are also known as shop books or account books.

Examples: Examples of books of account include sales books, purchase books, cash books, and ledger books. These books are used to record all financial transactions that occur within a business. For instance, a sales book would record all sales made by a business, while a purchase book would record all purchases made by the business.

Explanation: Books of account are essential for any business as they provide a detailed record of all financial transactions. They help business owners keep track of their income and expenses, which is crucial for making informed decisions. For example, if a business owner notices that their expenses are increasing, they can use their books of account to identify the cause and take appropriate action.