Before revision: In cloud computing, the term zero-knowledge (or occasionally no-knowledge or zero access) refers to software services that store, transfer or manipulate data such that it is only accessible to its owner, not to the service provider.
After revision: In cloud computing, the term zero-knowledge (or occasionally no-knowledge or zero access) refers to an online service that stores, transfers or manipulates data in a way that maintains a high level of confidentiality, where the data is only accessible to the data's owner, and not to the service provider.