# Trigger
## Overview
Trigger is a mechanism that initiates an action when an event occurs such as reaching a certain time or date or upon receiving some type of input. A trigger generally causes a workflow to be executed.
{% hint style="info" %}
For instance, your application could execute a workflow at a specific time.
{% endhint %}
## Getting started
Navigate to your **Workspace > Apps** and click on the gear icon
to activate the configuration mode of your applications. Next, click on the gear icon of the application you wish to configure. In the **Execution** section you click on **Trigger** to access the Trigger Designer. When you open the designer, as in other designers, the management window opens with the list of all created triggers.
Using the trigger management window, you can clone or delete existing trigger or create new trigger for your application.
## Trigger configuration
The trigger configuration window is divided in two sections, the trigger property fields and a section to configure the trigger.
### General
General configuration define the basic properties of your trigger with some descriptive information such as name and description.
### Trigger
In the trigger section, the kind of trigger is defined and the class assigned to the trigger is selected. The available trigger kinds are:
* Hook
* Time
{% hint style="info" %}
The **class** selection is compulsory when creating a trigger.
{% endhint %}
## Building your trigger
As mentioned before, there are two types of triggers that differ in the configuration settings.
### Hook
With a hook as a trigger, an insertion method, or specifically a workflow is executed (triggered) on a particular action.
Multiple hooks can be added to each trigger. A hook consists of the properties hook kind and a list of conditions. The **kind** of the hook is the action that will trigger this trigger when executed. Possible actions are create, update and delete.\
In the list of **conditions**, the conditions are entered that must be fulfilled when the action is executed. If the conditions are not fulfilled, the configured workflow will not be executed either.
### Time
If Time is selected as the type of hook, the **start time** for execution of a workflow can be selected. Also several times can be added.
### Workflow
In the workflow tab, a workflow of the previously configured class can be selected. This workflow will be executed whenever this trigger is released.\
From the context menu on the right side of the selection field you can create a new workflow, edit the selected workflow and reload the list.
## Validate and save
You can also check the validity of your trigger configuration by selecting the **Validate** option or save your current configuration by selecting **Save** from the bottom menu.
Validation errors are displayed as toast notification at the top of the platform interface.
{% hint style="danger" %}
In case your trigger is invalid, the system will not allow it to be saved.
{% endhint %}
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