# Units: Data feed

> The feed unit, in brief.

Glider documentation · Logic · Web page: https://cgglider.com/docs/units/poller/

Sections of this page: [Overview](https://cgglider.com/docs/units.md) · [Clock](https://cgglider.com/docs/units/clock.md) · [Counter](https://cgglider.com/docs/units/counter.md) · [Ticker](https://cgglider.com/docs/units/ticker.md) · [Formatter](https://cgglider.com/docs/units/formatter.md) · [Watch rule](https://cgglider.com/docs/units/watch-rule.md) · [Data feed](https://cgglider.com/docs/units/poller.md) · [Runtime & gating](https://cgglider.com/docs/units/runtime.md) · [Commands & API](https://cgglider.com/docs/units/commands.md)

A data feed maps fields of an outside payload onto store paths. It polls an HTTP endpoint, holds a WebSocket open, or receives webhook pushes, in JSON, XML or text. Every feed needs at least one field mapping; HTTP and WebSocket feeds also need a URL.

## Actions

- start · stop — control the feed
- refresh — fetch once, now (HTTP only)
- ingest — hand it a payload directly, without a call

See the Data Feeds page for HTTP, WebSocket and webhook feeds, formats, mapping, scheduling and probing in full.