The Graph API is Meta's HTTP API for Facebook and Instagram. If software publishes a post, reads insights, or manages an account on either platform, it goes through the Graph API. The name comes from Meta's "social graph": people, pages, and posts as connected nodes.
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What it is used for
For Instagram, the Graph API covers professional accounts: publishing posts through media containers, reading account insights, and managing account data. Access requires an OAuth grant with the right scopes, and the permissions your app can request depend on Meta's app review process.
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Working with the Graph API
The Graph API is versioned, and each version has a retirement date, so integrations need regular upkeep as fields and permissions change between releases. It also enforces its own rate limits per app and per user. This maintenance load is a big part of why unified APIs exist: they track Meta's changes so each product built on top does not have to.
Go from the definition to the docs that show how to apply it.
Primary solution Connect an Instagram account