Clarification needed on how application components are split

[alanbort]

Issue in ./help/getting-started/new-relic-reporting.md

When using the Send Adminhtml and Frontend as Separate Apps it is not clear what the application suffix/components mean.

E.g.:

adminhtml
frontend
crontab
global
webapi_rest
graphql

I couldn't find documentation on this, though most are fairly self-explanatory a table explaining what each compoent is or how to identify them would be helpful. Probably devs can provide insight into this topic.