Alright, folks! We're diving into the whacky world of depreciation - yes, it’s as thrilling as a rollercoaster ride! Depreciation is like the apple of the accounting world's eye, because it's the method they use to spread out the cost of an asset over its useful life. Think of it like an aging rockstar, less useful with each passing year. It's a bittersweet symphony, but the cost of the asset doesn’t just disappear after purchase. Instead, it gets its moment in the spotlight, spread out like a peacock's tail, over time. So, depreciation is part of the cost because it's the way we account for the value an asset loses as it ages and we use it. That's it, folks, depreciation - the superstar of costs!