Asynchronous Triggers are released in Summer '19. Here is the blog post: https://developer.salesforce.com/blogs/2019/06/get-buildspiration-with-asynchronous-apex-triggers-in-summer-19.html
This was the top post in Google while I was looking for documentation on the new async trigger feature and figured it would be worth updating.
Yes, we can initiate asynchronous requests from Apex Trigger
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_triggers.htm
They can come in very handy when you have multiple processes working on the same trigger.
You can create time based workflows or use process builder but to a limited extent only.
https://developer.salesforce.com/blogs/2019/06/get-buildspiration-with-asynchronous-apex-triggers-in-summer-19.html
This was the top post in Google while I was looking for documentation on the new async trigger feature and figured it would be worth updating.