What is NoSQL?

Let's move on to the definition of NoSQL. Several NoSQL database systems have grown rapidly in popularity over the last few years. They are non-relational DMSs that support structured data, unstructured, semi-structured, and polymorphic data.

At a high level, NoSQL just means not only SQL. Thus, it doesn't speak to a single database offering-- rather, it's a collection of diverse technologies. Don't assume that the databases are similar in nature either.

As stated, there are no official rules as to what makes a database NoSQL. The term describes more about what they aren’t.

NoSQL Databases:

• typically don't use SQL
• usually don't store data in tables
• usually don't care about relationships
• usually don't provide ACID transaction
• usually don't require formal data schemas (making them more flexible)