---
title: "API – definition, meaning and examples | Sweet Lava"
description: "An API is the standardised way programs exchange data and delegate operations. See how it works and where you meet APIs in everyday products."
url: https://sweetlava.eu/en/glossary/api/
lang: en
alternate_pl: https://sweetlava.eu/pl/slownik/api/
---

Technology 

# What is API?

An API (application programming interface) is the standardised way programs talk to each other: a set of rules that lets one application fetch data from or delegate operations to another system.

An API is like a waiter between the dining room and the kitchen: the application places an order ("give me the product list"), the system on the other side fulfils it and returns the result. Through APIs a store connects to a payment provider, an app to maps, a website to a CRM – without knowing their internals.

In product design the API determines flexibility: a well-designed one lets you connect a website today, a mobile app tomorrow and a partner integration next month – all to the same data.

**For buyers:** ask "does it have an API?" about every system you purchase. No API means manual data re-entry and lock-in to a single vendor.

## Related services

- [ Web applications & SaaS development → ](https://sweetlava.eu/en/services/web-apps-saas/)

## Related terms

- [Backend](https://sweetlava.eu/en/glossary/backend/)
- [CMS & headless CMS](https://sweetlava.eu/en/glossary/cms-headless-cms/)
- [SaaS](https://sweetlava.eu/en/glossary/saas/)

## Planning a web app or a SaaS product?

We take projects from idea through MVP to launch. Scope, timeline and quote within a few days.

[ Get in touch ](https://sweetlava.eu/en/contact/?source=glossary-api)