# Glossary

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The following table lists all the commonly used terms and their definitions used in GlobalTopUp APIs:

<table><thead><tr><th width="154">Terms</th><th>Description</th><th data-hidden></th></tr></thead><tbody><tr><td>API</td><td>API (Application Programming Interface) is a software code using which two applications can talk to each other.</td><td></td></tr><tr><td>API Key</td><td>An API key is a unique identifier that enables other software to authenticate a user, developer, or API calling software to an API to ensure that this person or software is who it says it is.</td><td></td></tr><tr><td>Curl</td><td>A command line tool for transferring data in various protocols, in our case HTTP. Many of the API example calls are made in the cURL syntax. For more information about cURL, visit the <a href="https://curl.haxx.se/">cURL website</a> .</td><td></td></tr><tr><td>Endpoint</td><td>An API endpoint is the point of entry in a communication channel when two systems are interacting. It refers to touch points of the communication between an API and a server.</td><td></td></tr><tr><td>HTTP</td><td>The Hypertext Transfer Protocol (HTTP) is designed to enable communications between clients and servers. HTTP works as a request-response protocol between a client and server.</td><td></td></tr><tr><td>JSON</td><td>JavaScript Object Notation is a way to transport and store data. JSON is smaller than XML and easier to parse. For more visit the <a href="http://www.json.org/">JSON website</a> .</td><td></td></tr><tr><td>Rate Limit</td><td>Rate limit is the number of API calls an app or user can make within a given time period. If this limit is exceeded, the app or user may be throttled.</td><td></td></tr><tr><td>Webhooks</td><td>Webhooks are a means by which applications automatically communicate with each other. Webhooks allow you to receive real-time data from an app when an event happens.</td><td></td></tr></tbody></table>


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