---
type: "Glossary term"
title: "API calling"
description: "Outbound calls to remote services (REST, GraphQL, gRPC, events)."
tags: [glossary]
generated: { by: human:crpage, at: 2026-07-09T09:44:00Z }
aliases: "api calling; api call"
status: stable
---

# Definition
The broader class of outbound interactions with remote services — REST, GraphQL, gRPC or event-driven — not necessarily via a vendor 'function' abstraction.

# Used in this bundle
Appears in: [openapi](../standards/openapi.md).

# Related terms
[function calling](function-calling.md), [tool use](tool-use.md).