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Polling interval: add definition (#35353)

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* Polling interval: add definition

* Re-add intro

* Update source/common-tasks/general.markdown
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source/common-tasks/general.markdown
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@ -9,11 +9,17 @@ This section provides tasks that do not depend on a specific Home Assistant inst
## Defining a custom polling interval
Creating an automation for polling gives you more flexibility on when to poll.
If you want to define a specific interval at which your device is being polled for data, you can disable the default polling interval and create your own polling automation.
Why use an automation instead of changing the integration's configuration for polling?
## What is data polling?
1. Not all integrations have a configurable polling interval. The homassistant.update_entity service on the other hand works with most of the integrations, no code changes required.
Data polling is the process of querying a device or service at regular intervals to check for updates or retrieve data. By defining a custom polling interval, you can control how frequently your system checks for new data, which can help optimize performance and reduce unnecessary network traffic.
## Why use an automation instead of changing the integration's polling configuration?
Creating an automation for polling gives you more flexibility on when to poll:
1. Not all integrations have a configurable polling interval. The homeassistant.update_entity service, on the other hand, works with most of the integrations; no code changes are required.
2. An automation allows you to poll whenever you want. For example, if you have a rate-limited solar panel provider with a maximum number of requests per day, you may want to lower/stop the polling at night but poll more frequently during the day.
{% include common-tasks/define_custom_polling.md %}