Final answer:
REDIS is an example of a Key-value type of NoSQL datastore, which is known for its speed and efficiency due to in-memory storage, in contrast to other types like MongoDB's document-oriented or Neo4j's graph databases.
Step-by-step explanation:
An example of a Key-value type of NoSQL datastore is REDIS. Key-value stores are a type of NoSQL database that use a simple key/value method to store data. REDIS is a popular open-source key-value store that is known for its speed and efficiency.
It stores data in memory, which allows for very fast read and write operations, making it suitable for applications that require high performance such as caching, session management, and real-time analytics. Unlike REDIS, MongoDB is a document-oriented database, while Neo4j is a graph database, and Sesame is an open-source framework for processing RDF data.