Glossary
API
Application Programming Interface
What is an API?
An API (Application Programming Interface) is a set of rules and protocols that allows one piece of software to talk to another. It defines what requests can be made, how to make them, and what data comes back - acting as a contract between two applications.
Think of an API as a waiter in a restaurant: you do not need to know how the kitchen works. You place an order in an agreed format, the waiter carries it to the kitchen, and brings back exactly what you asked for. Most modern web APIs use HTTP and exchange data in JSON format, often following the REST style.
Why APIs Matter
- Integration - Connect separate systems, like syncing a booking platform with an accounting tool
- Automation - Replace manual data entry with software that exchanges data automatically
- Reuse - Build on existing services (payments, maps, email) instead of writing them from scratch
- Security - Expose only specific, controlled functions rather than the whole system
- Scalability - Let many apps and partners use the same service consistently
APIs in Practice
- Payments - Stripe and PayPal APIs let websites take card payments securely
- E-commerce - The WooCommerce REST API connects stores to shipping, stock, and CRM tools
- Email and DNS - DMARCsimple uses APIs and DNS lookups to monitor email authentication
- CCMS products - TUITIONsimple, STORAGEsimple, and SERVEsimple use APIs to integrate with payment and notification services