Dell DRAC similar systems like HPE ILO and IPMI are so called light out management or out of band management tools. They are used to administer servers even when the host OS is broken, non existent or shutdown. Most have a KVM functionality. They can also be used for a bunch or other stuff like alerting, setting up hardware raid, changing bios settings, automatically updating firmware, logging of various telemetry,

It's a very, very useful tool but it's not really meant to be used as a daily replacement to SSH, RDP, or similar tools.

And yeah while monitor and keyboard carts (aka crash carts) are common in data centers. They are very undesirable compared to lights out management, since you have to be physically on location in a very noisy and frankly hostile environment to use it.