Document databases and distributed key-value stores have different interfaces, offer different isolation and durability guarantees, and accept very different types of queries.

Relational Database Relational database stores data in the form of tables (also called a relation) with different tables linked to each other via some data item.

Database normalization is the cornerstone of database theory. Once a database is normalized, relationships between the data in multiple tables must be established.

What does relational database actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.