What Is an API?
An API lets different software systems talk to each other. Understanding APIs helps you connect your tools and automate your business.
Key Takeaways
- An API is a standardised way for one software system to request data or actions from another
- APIs are what allow your eCommerce platform to talk to your accounting software
- REST APIs are the most common type — they use standard web requests
- You do not need to write code to use many APIs — no-code tools like Zapier do it for you
What an API is
An API (Application Programming Interface) is a standardised set of rules that allows one software system to request data or trigger actions in another. When your Shopify store automatically updates your inventory in Xero after a sale, an API is making that happen. When you check a shipping rate in your eCommerce platform, an API is fetching that rate from the carrier's system in real time.
The restaurant analogy
The most common API analogy: think of an API like a waiter in a restaurant. You (the customer) want food from the kitchen (the server). You do not go directly to the kitchen — you tell the waiter what you want, the waiter takes your order to the kitchen, the kitchen prepares it, and the waiter brings it back to you. The waiter (API) is the standardised interface between you and the kitchen, handling the communication in both directions.
REST APIs
The most common type of API in modern web software is the REST (Representational State Transfer) API. REST APIs use standard web requests — GET (retrieve data), POST (create data), PUT (update data), DELETE (remove data) — to communicate. When you use a service like Shopify, Stripe, Amazon, or Google Maps, they all expose REST APIs that allow other software to interact with their platform programmatically.
Why APIs matter for your business
APIs are the connective tissue of the modern software stack. They allow your eCommerce platform to sync with your warehouse management system, your payment processor to notify your accounting software, your CRM to update when a customer places an order, and your AI tools to access your business data in real time. The more your systems are connected via APIs, the less manual data entry, the fewer errors, and the more powerful your analytics.
Using APIs without coding
You do not need to be a developer to use APIs. No-code integration platforms like Zapier, Make (formerly Integromat), and n8n allow you to connect APIs through a visual interface — if this happens in System A, do that in System B. These tools make API integrations accessible to non-technical founders and operators. For more complex or custom integrations, a developer or a specialist platform like AskBiz can handle the API connection for you.