BEGINNER ESSENTIAL
API
An interface for programs to request capabilities and exchange data.
An everyday example
A menu defines available requests and required details.
- Fill an orderRequest
- Deliver to counterEndpoint
- Check and processBusiness logic
- Read the receiptResponse & status
API documentation defines inputs and outcomes. Transport success and business success differ; a delivered receipt can report insufficient stock.
Where this term is useful
These are related contexts, not prerequisites.
Back in the project
When it comes up: When connecting external services such as login, AI, or payment.
What to do next: Specify inputs, outputs, and failure handling; keep secrets out of public pages.
Open the related method and stepsWhat can this analogy leave out?
HTTP success may not mean business success; retries must avoid duplicate writes or charges.
Everyday examples explain roles and relationships; actual behavior follows the tool, language, or platform.