(I'm not going to crosspost this because I have no clue how to censor this and not get absolutely destroyed by bots 🩶)

They are both related to two sort of...I don't want to say opposed but fundamentally different approaches to BDSM practices. SSC stands for Safe/Sane/Consensual. Generally when you're practicing SSC there's the understanding that there won't be things deemed "unsafe". RACK stands for Risk-Aware Consensual Kink. This is where you get into things like edgeplay! The general idea behind RACK is that nothing is 100% safe. You just aim to be as safe as possible while still engaging with your consensual kink.

There's an interesting history of where RACK came from in contrast to SSC, if you're ever interested in doing some research. It stems from the reputation S/M had (and still has!) both within the community and outside of it. I mention both in my carrd because I do have fics in the works that border on or are fully S/M, so I want to make sure people are aware.

Thanks for asking!