Are half-dollar coins still used today?

Excuse me, I was wondering if you could clarify something for me. I came across the phrase "half-dollar coins" and I'm curious to know if they're still in circulation today. Do people still use half-dollar coins as a form of payment, or have they largely been phased out in favor of other denominations? I'm interested in understanding the current state of their usage and whether they still hold any significance in the modern financial system. Thank you for your time.