Transactions refer to the process of exchanging goods, services, or information between parties, typically involving some form of validation or record-keeping. In economic and business contexts, a transaction often implies a contractual agreement where value is transferred, be it money, goods, or services. In the digital world, transactions can take place electronically and be facilitated by various technologies, such as credit card processors or blockchain networks. Transactions serve as the building blocks of any economic system and are crucial for the functioning of markets. They can be simple, involving just two parties, or complex, requiring a network of entities for completion. The concept is not limited to the financial realm; in computing, a transaction might refer to a set of operations that transform a system from one state to another, following principles like atomicity, consistency, isolation, and durability (ACID). Regardless of the context, the integrity, security, and efficiency of transactional systems are paramount for ensuring trust and reliability.