A database is an organized collection of data, or information, that is specially organized for rapid search and retrieval by a computer. According to , a database is usually controlled by a database management system (DBMS), which is a software that interacts with end users, applications, and the database itself to capture and analyze the data. A database can be classified into different types based on how the data is structured, stored, and accessed. Some of the common types of databases are:
Relational databases, which model data as rows and columns in a series of tables, and use SQL (Structured Query Language) for writing and querying data. Examples of relational databases are Oracle Database, MySQL, PostgreSQL, etc.
NoSQL databases, which do not follow the relational model and use different ways of storing and querying data, such as key-value pairs, documents, graphs, etc. Examples of NoSQL databases are MongoDB, Redis, Neo4j, etc.
Cloud databases, which are hosted on cloud platforms and provide scalability, availability, and security benefits. Examples of cloud databases are Amazon DynamoDB, Google Cloud Firestore, Microsoft Azure Cosmos DB, etc.
Self-driving databases, which are autonomous databases that use machine learning and automation to perform tasks such as provisioning, tuning, backup, recovery, etc. Examples of self-driving databases are Oracle Autonomous Database Cloud Service , CockroachDB , etc.