What Is an API?

The Contract Is The Important Part.

An API states what can be asked, in what format, what comes back, and what happens when something fails. Because that contract is explicit, two systems built by different teams at different times can work together reliably.

Software engineers collaborating on api architecture, component code, and system standards — Engineering scalable API minimises technical debt and accelerates deployment velocity.

It is what makes integration durable.: An interface changes when a vendor redesigns a screen; a published API is versioned, with deprecation notice, precisely because other systems depend on it. This is the difference between an integration that survives and one that breaks at the next update.
APIs are also how most modern software is assembled.: Payments, messaging, mapping, document generation and AI models are all consumed this way, which is why 'can it integrate' is now a procurement question rather than a technical detail.
The questions worth asking about any system are consistent: is there an API at all
is it documented
is it versioned
what are the rate limits
how does it authenticate
A system that fails those is a system that will be expensive to connect later.

Covered in Systems IntegrationCustom Software

Frequently Asked Questions

Why Does It Matter Whether A System Has An API?

Because it decides how expensive that system is to connect to anything else. Without one, integration means driving screens or exporting files, both fragile. With one, the connection is a documented contract that survives updates.

What Is The Difference Between An API And A Webhook?

An API is something you call when you want data. A webhook is something that calls you when an event happens. Most integrations use both: webhooks to learn that something changed, APIs to fetch the detail.

What Does This Cover?

An API is a defined way for one piece of software to request something from another (retrieving data, creating a record, triggering an action) through a documented contract rather than through a human interface.

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The Contract Is The Important Part.

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