List

A Redis list stores an ordered sequence that permits repeated values. A sorted set stores unique members ordered by numeric scores. The useful distinction is not that one is universally faster or cheaper: it is whether the application needs positional sequence operations, unique membership, score ranges, or a combination requiring a different data model. ...

A Redis list is an ordered sequence of byte values with operations at both ends. Choosing the push and pop ends determines whether it behaves as a queue or a stack. Blocking operations wait for data; they are not distributed locks, acknowledgements, or a complete message-processing protocol. ...