---
title: "Models and databases"
version: 1.9
locale: en
source: https://docs.djangoproject.com/en/1.9/topics/db/
canonical: https://djangodocs.dev/en/1.9/topics/db/
---
# Models and databases

A model is the single, definitive source of data about your data. It contains
the essential fields and behaviors of the data you’re storing. Generally, each
model maps to a single database table.

- [Models](/en/1.9/topics/db/models/)
- [Making queries](/en/1.9/topics/db/queries/)
- [Aggregation](/en/1.9/topics/db/aggregation/)
- [Managers](/en/1.9/topics/db/managers/)
- [Performing raw SQL queries](/en/1.9/topics/db/sql/)
- [Database transactions](/en/1.9/topics/db/transactions/)
- [Multiple databases](/en/1.9/topics/db/multi-db/)
- [Tablespaces](/en/1.9/topics/db/tablespaces/)
- [Database access optimization](/en/1.9/topics/db/optimization/)
- [Examples of model relationship API usage](/en/1.9/topics/db/examples/)