Function-as-a-Service (FaaS), sometimes called serverless computing is an emerging paradigm, enabling you to run code even faster (that is, without the need to provision a machine or a container). Just provide your code, upload it to an end-point, define triggers and let the platform handle the rest (from scaling to failures).

Check out this recently published, free ebook on Serverless Ops:

Serverless Ops

Some further resources on the topic: