How do people make money on liquidity pools?

As a finance professional, I'm curious to understand the intricacies of liquidity pools and how individuals profit from them. Could you elaborate on the mechanisms behind liquidity pools and how users generate returns? Do they simply receive a share of the transaction fees, or are there additional incentives involved? What risks should investors be aware of when participating in liquidity pools? And how do the returns compare to traditional investment strategies? Clarifying these points would greatly aid my understanding of the earning potential within decentralized finance.