Iced coffee is brewed coffee that has been refrigerated before it’s ready for consumption. Cold brew, on the other hand, is made by placing coarsely ground coffee in room temperature water and letting it sit at room temperature for anywhere from 12 to 24 hours. During this time a process called “cold extraction” takes place where all the flavors mix together and the mix separates into a liquid below and a thick layer of sediment above. The liquid can be strained off with a filter or cheesecloth before drinking, leaving behind only the strong concentrated flavor of cold brew without any added ice cubes for those who prefer their drink chilled but not watered down from extra water ice cubes would add.
You can also have a look in the articles that we have in our Coffee Lab: https://www.eraofwe.com/coffee-lab/en/articles/how-to-choose-between-iced