1.2 Data models and query languages - KeynesYouDigIt/Knowledge GitHub Wiki

from Designing-Data-Intensive-Applications

NoSQL

Its a better version of older document stores, great for loosely structured and or non-related data

SQL

The OG, by far the most common. Heavily structured and schematized. Still in use and probably will be for schematized data forever.

Graph

Quickly rising, excellent for data where the relationships are more important than the underlying data AND OR relationships often follow many points, not just one. Invented to deal with social networks, can be used for much more.