Lesson 4: What is the purpose of an Aggregator in "Interfaces & Price Feeds"?

[affanmustafa]

I am trying to understand the purpose of an aggregator function and the whole thing about using a V3 Interface and so on. The following questions are coming in my mind which I am not really understanding:

1. What exactly is an aggregator and what is the purpose of it in this scenario?
2. When Patrick uses .version() in the timestamp 4:06:40, how does the contract know which version to return if the interface only consists of the function and variable declarations and not the logic behind the function? What exactly is going on here?

Help here in understanding would be greatly appreciated.

[alfaqi]

In simple words, Blockchain can't interact with regular network. we need someone play as intermediary, so we can interact with Blockchain.
2- When you deploy the contract, you will provide the address of the contract that contains the .version() function.
As I understood