65Backend & dataEssential

Query

The operation that fetches data from a database, usually written in SQL or another query language.

For example

Query the user where id = 1 with SQL.

Resources

Copy prompt

Write a SQL query that returns this result from these tables.

Related terms

What users cannot see, handling data and business logic behind the scenes.

For example

When I log in, the backend verifies my account and password.

Where data is stored long term: user details, saved items and so on.

For example

The words I saved live in the database and are still there next time.

The window through which two pieces of software place orders at each other.

For example

My app sends a word to the AI through an API and gets the explanation back.