I didn't want hijack the other seafoam thread, but I read that and I was like... HUH?!?!?

I'm an admitted NON-mechanic but trying to act like one after buying my first 93 s10 Blazer and trying to get a small miss/hesitation out.

So I've used Seafoam in the gas tank for years on other vehicles and motorcycles, but the other thread mentioned putting it in a vacuum line that's off the brake booster?!

Can someone help a newb here and tell me what that's for and what other uses and applications that there is for Seafoam other than putting it in the gas tank?