An overview of AWS Nitro, which they are trying to copy, is helpful:

https://perspectives.mvdirona.com/2019/02/aws-nitro-system/

Basically PCI cards to put into commodity servers. That do various types of hardware offload for routing, switching, storage, security, etc. Probably with out of the box hypervisors and management for those functions.

I imagine they want to sell direct to cloud providers like Digital Ocean and IBM. And perhaps through Dell, VMWare, etc, for Enterprise customers that want high end private clouds.

FPGA based accelerators is my guess.