Technical Terms Glossary

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You will learn

The following glossary is an overview of basic technical terms to familiarize yourself with when first learning about Klaviyo's APIs. Looking for a glossary of Klaviyo-specific terms? Check out our Klaviyo Glossary


  • API Application Programming Interface. Allows a piece of software to talk to another and pass information between them.
  • Authentication - Helps to keep your account secure by verifying your credentials when attempting to connect to the API.


  • Client - The hardware or software that you, the end user, uses to communicate with Klaviyo via API.


  • DELETE - The HTTP Method that allows you to remove a resource from your Klaviyo account.


  • Endpoint - The URL of the Klaviyo server where your resources can be accessed.


  • GET - The HTTP Method that allows you to retrieve or read data from your Klaviyo account.


  • HTTP - Standard web protocol for data exchanged between a client and a server.
  • HTTP Methods - The verbs or actions used to constrain the type of API call you make.


  • JSON - JavaScript Object Notation. A format for storing and transporting data from a server to a client or web page.


  • Language library - In computer programming, a collection of pre-compiled routines used by programs.
  • List API - Klaviyo's API for for creating profiles and managing list memberships and subscriptions.


  • Parameters - Variable options that can be included in an API call to influence the response
  • PATCH - An HTTP Method that allows you to modify a resource.
  • POST - The HTTP Method that allows you to create or write a new resource to your Klaviyo account.
  • Postman - Third-party software that can be used to make API calls.
  • PUT - The HTTP Method that allows you to update an existing resource in your Klaviyo account.


  • REST - Representational State Transfer. Programming architecture that makes it easier for systems to communicate with each other.
  • Response - The reply to an API request which returns the requested resource in a readable format.


  • Server - Computer hardware or software that manages resources and provides functionality to clients.


  • Webhook - Allows apps to transfer data between each other in real-time.
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