Can anyone explain the role of lender?

I’m in a class of property is the definition and confuses the hell outta me. “Lenders in savings through aggregation, and then allocated to individuals or companies that invest in fixed assets.” From my understanding of the lender, the bank being. What are they invest, as they are, the money to the person wants the mortgage. Including investors in this concept and what I am investing assets sie.Klar confused please give a good explanation.

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