The definition of a note is quite simple. A note is a physical representation of your capital (the lenders) given to you by the borrower. The note tells all parties involved how much you are lending, what is the rate of return, when you should expect that note to be repaid, and the payment structure of the note. This is just like REAL money because it’s a legally binding document, enforceable in court that is a representation of the exact amount of money you loaned. Keep it secret, keep it safe.