What is a NoSQL database?

The NoSQL database gets its name from what it isn’t: It’s a database that does not use Structured Query Language (SQL) to access the data. Some of the well-known databases, such as Oracle and PostgreSQL, are SQL databases, but most new databases that have been introduced over the past few years are considered NoSQL databases. Some people insist that NoSQL is not the exact opposite of SQL and argue that the name really stands for “Not Only SQL.” Either way, what’s important is that NoSQL databases relaxed many of the requirements that defined earlier SQL databases.

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