Ledger Database
A NoSQL database that provides an immutable, transparent, and cryptographically verifiable transaction log owned by a central authority. [Source: Medium]
Load Balancer
Load balancing is defined as the methodical and efficient distribution of network or application traffic across multiple servers in a server farm. Each load balancer sits between client devices and backend servers, receiving and then distributing incoming requests to any available server capable of fulfilling them. [Source: Citrix]