Commands in the terminal, what to read?

Question

linux

Hello! I trained in writing native applications in ruby ​​and came across this:

begin
  system("stty raw -echo")
  mode = STDIN.getc
ensure
  system("stty -raw echo")
end

And specifically in all this I don’t understand
system("stty raw -echo")
What is it and where can I read about it? Google refused to help me :(

Answer 1

man stty - first link in google https://www.opennet.ru/man.shtml?topic=stty&category=1