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API
Application Programming Interface - a set of rules that allows different software applications to communicate with each other.
What is API?
An API defines how software components interact. When you use a weather app, it uses an API to request data from weather services. APIs allow your website to integrate with payment processors, shipping calculators, social media, and countless other services without building everything from scratch.
Example
When you click 'Pay with PayPal' on a website, the site uses PayPal's API to securely process your payment without handling your card details directly.