Every time someone on your team asks "can we integrate with Salesforce?" or "can we pull data from Google Maps?" they are asking an API question. Understanding what an API is — and how it works — helps you scope work, set realistic timelines, and ask engineering the right questions before a commitment is made.
The restaurant analogy
Think of an API as a waiter in a restaurant. You are the customer, the kitchen is the server (the system that actually does the work), and the menu is the API — the defined list of things you can request. You never walk into the kitchen directly. Instead, you tell the waiter what you want using the menu's language, the waiter carries that request to the kitchen, and returns with exactly what was ordered. The API works the same way: it defines what you can ask for, enforces the rules for how you ask, and delivers the response. You never interact with the underlying system directly.
Why non-engineers interact with APIs constantly
Every integration your product uses is an API connection. When your checkout flow processes a payment, it calls Stripe's API. When your CRM syncs with your product, it calls a Salesforce API. When your support tool shows a map of a customer's location, it calls Google Maps' API. When your analytics tool pulls event data from your product, it calls your product's API. Integrations are not magic — they are structured requests between systems following agreed-upon rules.
The four HTTP methods you need to know
APIs communicate using a small set of verbs. GET fetches data without changing anything — like loading a user's profile. POST creates something new — like submitting a form or placing an order. PUT or PATCH updates something that already exists — like changing a billing address. DELETE removes something. Knowing these four lets you read a technical spec and understand what an integration actually does before your engineering team has written a single line of code.
Status codes that matter
When an API responds, it includes a status code that tells you whether the request worked. 200 means success. 400 means your request was malformed — you sent the wrong data. 401 means you are not authenticated — your credentials are missing or wrong. 404 means the thing you asked for does not exist. 500 means the server broke — that is not your fault, it is a problem on the other end. These codes appear in error logs, in Slack alerts, and in bug reports. Knowing them means you can follow a technical conversation and ask useful questions before engineering has even looked at the issue.
What to ask when an integration breaks
Three questions let you sound competent before the engineering team has investigated. What is the status code? When did it start failing? Did anything change on either side recently — a deployment, a credential rotation, a schema update? These questions narrow the problem space significantly. They signal to your team that you understand how integrations work, and they often surface the answer before anyone has opened a terminal.