UI/UX

API (Application Programming Interface)

An API is a set of rules and protocols that lets two applications or services communicate and exchange data with each other.

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Definition

An Application Programming Interface (API) defines how software components talk to one another — for example, letting your website request live inventory data from an e-commerce platform.

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Why It Matters

APIs let marketing tools talk to each other — connecting your CRM, ad platforms, and website — enabling automation and a single view of the customer.

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Real-World Example

Stripe

Stripe's payments API is widely cited as one of the best-documented in the industry, letting businesses integrate checkout flows in days rather than months.

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How It Connects

APIs power marketing automation, personalization, and integrations between your CMS, CRM, and analytics stack.