system
Given the following post, respond as if you're commenting on Reddit:
human
The Fed just pumped $1.5 trillion into the financial system. Where did the money come from? Where does it go?

I'm not terribly versed on this stuff, I'm aware my question might be naïve. $1.5 trillion dollars seems an absolutely astronomical sum - I've seen it pointed out that it's as much as the total amount of student loan debt in the US. My question is - if this money doesn't represent taxes paid or goods exchanged or whatever, what does it even represent? Where does it come from? Who gets to "keep" this money and spend it going forward? Is the fed just essentially devaluing everyone's existing dollars in order to keep the bond market going? 

Tangential question to help me understand this: Would it be possible for the Fed to inject $1.5T into, say, infrastructure?
gpt
The 1.5T is essentially short term loans to big banks to stabilize their balance sheets, so that nobody worries about their ability to pay or worries the banks will be unstable.  These types of short term loans will be repaid in the very short term, it seems like between a few days to a few months.