$ (Money) is a medium of exchange that facilitates transactions for goods and services. It can exist in various forms, including coins, paper bills, and digital currency. Money serves as a unit of account, allowing people to measure the value of items, and as a store of value, enabling individuals to save and plan for future expenses. The concept of money has evolved over time, from barter systems to the use of precious metals and eventually to fiat currency, which is government-issued and not backed by a physical commodity. Today, digital forms of money, such as cryptocurrencies like Bitcoin, are gaining popularity, further transforming how people conduct financial transactions.