API is application programming interface, a structured way for software systems to communicate and exchange data.
Example of API
A booking site requests available time slots from a scheduling service through an API. It must handle authentication, response formats, unavailable slots, and errors instead of treating every request as a successful booking.
Why API matters
It matters because development decisions affect speed, security, scalability, tracking, SEO, and maintenance. A site that looks good but is fragile or hard to update can quietly hold back every marketing channel.
Related terms
Frequently Asked Question
What does API mean?
API means application programming interface, a structured way for software systems to communicate and exchange data.