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).

To asses if your workload is a good fit, use servers.lol or check out this free ebook on Serverless Ops:

Serverless Ops

Some further resources on the topic: