# Campaign

A campaign is an invitation that you send out to recipients to take your survey.  ngSurvey supports following channels to send out your invitation. 

* [Distribution of your invitation using an email message to email recipients.](/form-management/campaigns/campaign/email-distribution.md)
* [Send your invitation through SMS / Whatsapp using recipients mobile phone numbers.](/form-management/campaigns/campaign/phone-sms-distribution.md)
* [Virtual campaigns to distribute your invitations using a third party platform.](/form-management/campaigns/campaign/virtual-campaign.md) 

A campaign starts as soon as you launch it however you can also setup [schedules](/form-management/campaigns/campaign/schedules.md) to start your campaign later on at a given point in time of your choice.

{% hint style="info" %}
You can adjust each campaign to a specific time zone. The time zone will then be used for all  date / times that you setup for your campaign for sending or reminding recipients.
{% endhint %}

## 🔒 Campaign encryption

Recipient of your campaign can be [encrypted](/data-encryption/campaign-encryption.md) inside the database based on the [data classification](/data-encryption/data-classification.md) that you set for the campaign.

![](/files/-MI4QAGp9FF5ruVPh6oB)

## 🔅 Campaign properties

* **`Track read / opening`** Tracks if a respondent has read the invitation message and if the respondent has clicked on the invitation link.
* **`Anonymous entries`** will not link the respondent's email to the respondent answers will delete the email from the database once the respondent has taken the survey.
* **`Invitation access code expiration`** set an expiration date after which the generated invitation access codes will expire and become invalid.   

{% hint style="warning" %}
The track read / opening feature requires that you have set your host domain in the [system settings](/installation-setup/system-settings/general.md). 
{% endhint %}

{% hint style="warning" %}
The opening tracker uses an invisible image inside the invitation message and will only count opened invitations if the respondent has activated images download in his email client.
{% endhint %}


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