Does macosx Catalina always use clang by default?

I have osx catalina installed and when I type gcc --version I get the following:

Apple clang version 11.0.3 (clang-1103.0.32.59)Target: x86_64-apple-darwin19.4.0Thread model: posixInstalledDir: /Library/Developer/CommandLineTools/usr/bin

I am confused as to whether my code uses gcc when it compiles or clang when I type gcc file.c -o file