Integrations are made of predefined triggers and actions that you can use in your boards.
They work very similarly to automations with the only difference being that, with integrations you cannot use a different trigger other than what has been predefined. If you would like to use a different trigger, use an automation.
How to access Date Check integrations
Example – Date Check Integration
Auto update dates based on user holidays using integrations (Demo) – https://bit.ly/3JY1x6t