ok so i'm working through a tutorial to get rvm installed on my mac. the bash command to get rvm via curl is

curl -L https://get.rvm.io | bash -s stable

i understand the first half's curl command at location rvm.io, and that the result is piped to the subsequent bash command, but i'm not sure what that command is doing. My questions:

-s : im always confused about how to refer to these. what type of thing is this: a command line argument? a switch? something else?

-s : what is it doing? i have googled for about half an hour but not sure how to refer to it makes it difficult.

stable : what is this?

tl;dr : help me decipher the command bash -s stable

to those answering this post, i aspire to one day be as bash literate as you. until then, opstards such as myself thank you for the help!