Domain fronting is a censorship circumvention technique which masks the site you are connecting to.
From the perspective of a censor, it appears like you are connecting to a major service which would be costly for a censor to block, like Microsoft or Google.
However, it does not make you anonymous, or completely hide your destination like Tor Browser does.
Fore more information see this blogpost about domain fronting.
No need to capitalize.
You can translate this term if it sounds better on your language.