What's the difference between an idler pulley and a tensioner pulley?

If you're even remotely interested in wrenching, you've probably heard of idler and tensioner pulleys, but if you're unsure ...
Forbes

The Serial Entrepreneur Who Doesn’t Need To Be First To Win

With Pulley, her fourth start-up, Yin Wu is pouncing on the niche market for cap table management software, now dominated by scandal-scarred Carta. On Sunday, January 7, Yin Wu’s inbox kept pinging ...