API (Application Programming Interface)Pillar

An API is a way for two systems to talk to each other in a structured, reliable way. Think of it like a waiter: you place an order (request), the kitchen prepares it (system), and you get the meal back (response). APIs are how CRMs, accounting tools, booking systems and websites pass data without copy-paste. If a tool has a good API, it is usually much easier to automate.