# APIs

What an app answers: its routes, who is calling them and what each caller may do.

| Page | What it covers |
|---|---|
| [HTTP](/docs/http.md) | A Jadpo app answers HTTP requests with routes. |
| [Sign-in and identity](/docs/identity.md) | Identity is how Jadpo knows who is calling. |
| [Policy](/docs/policy.md) | Policy says who may do what to which stored records. |