--- title: What is an API? description: An API (application programming interface) is an interface that enables interconnectivity between two different applications. --- [Skip to content](https://help.taponit.com/what-is-an-api#main-content) English Show submenu for translations [Can't find what you need?](https://help.taponit.com/kb-tickets/new?hsLang=en) ![TOI\_New\_Logo\_Horizontal (1)](https://help.taponit.com/hs-fs/hubfs/TOI_New_Logo_Horizontal%20(1).png?width=200&height=48&name=TOI_New_Logo_Horizontal%20(1).png) Open main navigation Close main navigation - English Show submenu for translations - [Can't find what you need?](https://help.taponit.com/kb-tickets/new) - [Client Resources](https://taponit.com/client-resources) [Client Resources](https://taponit.com/client-resources) Hi! How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://help.taponit.com/?hsLang=en) 2. [Features](https://help.taponit.com/features?hsLang=en) 3. [API](https://help.taponit.com/features?hsLang=en#api) April 26, 2023 # What is an API? ## An API (application programming interface) is an interface that enables interconnectivity between two different applications. Once one has been built, it allows for apps to perform actions and share data with one another seamlessly.  In the context of TapOnIt, APIs are used to power almost every opt-in method we provide, which includes web forms, website pop-ups, and landing pages. We offer a public API to our customers who wish to build a custom experience on their website or application while leveraging our technology for opting users in and sending them messages. Ready to add an API opt-in to your website? [This article](https://help.taponit.com/how-do-i-use-an-api?hsLang=en) can help. 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