How is securitization profitable?

Could you elaborate on how securitization becomes a profitable endeavor? I'm curious to understand the mechanisms behind it and how it generates returns for investors. Is it through the pooling of assets, the packaging of those assets into securities, or the subsequent sale of those securities on the market? And what role does risk mitigation play in ensuring the profitability of securitization? I'd appreciate it if you could break it down for me in a way that's easy to comprehend.