API

An API connects different software systems, allowing them to talk to each other. It enables founders to integrate third-party services like payments or maps without building them from scratch.

GraphQL is an API query language that lets clients request exactly the data they need. It solves over-fetching issues and speeds up frontend development but adds backend complexity.

This article defines Headless CMS architecture, explains how it differs from traditional systems via API delivery, and helps founders decide if it fits their technical strategy.