Blockchain is a distributed ledger technology that enables secure, transparent, and tamper-proof transactions. Blockchain is used in many applications, such as cryptocurrency, supply chain management, and voting systems. Popular blockchain platforms include Bitcoin, Ethereum, and Hyperledger. Learn more about us Continuous integration (CI) is the practice of continuously building and testing code changes as they are made, to catch and fix problems early in the development cycle. CI is an essential part of DevOps and agile software development. Popular CI tools include Jenkins, Travis CI, and CircleCI.