Do you know what a mortgage is?

I did not know what a mortgage was up until a minute ago when I read about what it is.
Do you know what a mortgage is?
Added (1). I read
Mortgages for dummies and now I know what it is.
Added (2). I did not know because I did not care. I will not be purchasing a house anytime soon. But I'm watching a documentary on the 2008 recession and I was not able to understand it because I did not know what a mortgage even was.
So, Now I know and now I can watch this documentary and understand it. Here it is. Watch it me.

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