请描述以下术语的含义: Big Data，AI和Blockchain。
- Big Data: refers to extremely large datasets that cannot be effectively processed using traditional data processing methods. 
- AI (Artificial Intelligence): refers to the development of computer systems that can perform human-like tasks, such as speech recognition, decision making, and natural language processing. 
- Blockchain: is a decentralized, digital ledger that records transactional data. It is designed to be secure, transparent, and tamper-proof, and has the potential to revolutionize the way digital transactions are conducted.