Cash refers to money that is readily available for use. It may be kept in physical form, digital form, or invested in a short-term money market product. A cash transaction refers to a business transaction which involves immediate payment or receipt of cash.
Concept of Cash Book
A cash book is a separate ledger in which cash transactions are registered.A cash book serves both journal and ledger purposes. In a cash book, information or narration about the source or use of funds are needed.