Postgres
Like a very organized spreadsheet that never forgets, it is the database where your app stores and finds structured data.
Imagine a set of labeled spreadsheets that never lose a row. Postgres is a relational database, which means data lives in tables with rows and columns that fit together by shared ids.
It matters because accounts, payments, and content need a safe home that can answer precise questions and keep data consistent.
In practice you create tables, add rows, and write queries, which are questions written in a database language called SQL, to read and update the data your app needs.