NoSQL databases are categorized into four main types:
Document Databases: Store data in documents, typically in JSON or BSON format. Each document can have a different structure, providing flexibility in data modeling. Examples include MongoDB and CouchDB.
Key-Value Databases: Store data as a collection of key-value pairs. They are simple and fast but lack complex querying capabilities. Examples include Redis and Amazon DynamoDB.
Column Family Databases: Store data in columns instead of rows, which is efficient for write-heavy applications and big data processing. Examples include Cassandra and HBase.
Graph Databases: Designed to store and navigate relationships. They are useful for social networks, recommendation engines, and anything else where you need to analyze and traverse relationships between entities. Examples include Neo4j and Amazon Neptune.
For those interested in cloud-based solutions, Tencent Cloud offers a variety of database services that cater to different needs, including NoSQL databases like TencentDB for MongoDB and TencentDB for Redis.