GraphQL
A query language for APIs that lets the client ask for exactly the data it needs in a single request, instead of fixed endpoints returning fixed shapes.
Analogy
Like ordering only the exact pizza toppings you want instead of a set menu.
Why it matters
It can cut over-fetching and round-trips when integrating data-heavy services, an alternative to REST worth recognizing.
In practice
One GraphQL query fetches a contact's name and last order only — nothing extra.