NoSQL : CAP

Distributed
– Sharding: splittng data over servers “horizontally”
– Replication

Lower-level than RDBMS/SQL
– Simpler ad hoc APIs
– But you build the application (programming not querying)
– Operations simple and cheap

Different flavours (for different scenarios)
– Different CAP emphasis
– Different scalability profiles
– Different query functionality
– Different data models

NoSQL: CAP (not ACID)
Consistency: each client always has the same view of the data.
Availability: all clients can always read and write.
Partition tolerance: the system works well across physical network partitions.

Source: AWS NoSQL DynamoDB