Why do people buy sand?

Good afternoon, esteemed audience. I'm curious to delve into the curious world of commodity trading, specifically the phenomenon of individuals purchasing large quantities of sand. Could someone please enlighten me on the underlying motivations for such a seemingly mundane yet potentially lucrative pursuit? Is it for construction purposes? Or perhaps there's a hidden gem within the sands of time that savvy investors have uncovered? I'm eager to understand the economic rationale behind this trend and how it fits into the broader landscape of global commodity markets.