NoSQL
/ˌnoʊ-ˈɛs-kjuː-ˈɛl/
n. “The database that doesn’t do relational the traditional way.”
NoSQL refers to a broad class of database management systems that diverge from the traditional relational model used by systems like MySQL or PostgreSQL. Instead of enforcing strict table structures, foreign keys, and joins, NoSQL databases store data in more flexible formats such as key-value pairs, documents, wide-column stores, or graphs.