Blockchain technology is a decentralized and transparent system that enables secure and fixed transactions. Blockchain has attracted a lot of attention with its ability to revolutionize various industries, including finance, supply chain management, and healthcare. The technology is built on the concept of a distributed ledger, where transactions are recorded in blocks and interconnected in a chain. This ensures that data cannot be altered or tampered with, providing a high level of confidence and security. Blockchain has the potential to simplify processes, reduce costs and increase efficiency by eliminating mediator and enabling peer-to-peer transactions. However, challenges such as scalability and regulatory issues still need to be addressed for widespread application. Overall, blockchain technology holds great promise for transforming industries and creating new opportunities for innovation. A key feature of blockchain is its distributed ledger, a digital record of transactions that are shared across multiple computers or nodes. Each transaction is grouped into a block and connected in a chronological chain. This decentralized method eliminates the need for a central authority or intermediary, such as a bank or government, to verify and authorize transactions. Instead, a consensus mechanism, often based on algorithms such as Proof of Work or Proof of Stake, ensures the integrity and validity of transactions. One of the main advantages of blockchain technology is its high level of security. Once a transaction is recorded on the blockchain, it becomes almost impossible to change or manipulate with it. This is because each block contains a unique cryptographic hash that is generated based on the data within the block and the hash of the previous block. Any attempt to modify a block would require changing the hash of that block and all following blocks, which is computationally unfeasible and would be immediately detected by the network. Blockchain technology has attracted significant attention for its potential application in finance. Cryptocurrencies, such as Bitcoin and Ethereum, are built on blockchain technology and enable peer-to-peer transactions without the need for intermediaries. This has the potential to reduce costs, increase efficiency and provide financial services to the population that does not have banking. Additionally, blockchain can facilitate faster and more secure cross-border transactions, simplify supply chain management by tracking the movement of goods, and improve transparency and responsibility in areas such as health care and voting systems. However, blockchain technology is not without its challenges. Scalability is a major concern, as current blockchain infrastructure struggles with large numbers of transactions simultaneously. This has led to slower transaction times and higher fees in some cases. In addition, regulatory frameworks and legal issues related to blockchain and cryptocurrencies are still evolving, which can create uncertainty and prevent widespread adoption.