What is aggregating information and how does it work? or Can someone explain what is aggregating info

Wow, didn’t expect so many great answers! Feedly and Inoreader sound perfect for what I need—gonna try them out tonight.

Quick follow-up: anyone know if these tools work well for academic stuff too? Like, can I aggregate research papers the same way as news?

(And yeah, *aggregating* is hard to spell, lol.)