Newer Mac Laptops have USB-C instead of MagSafe or MagSafe 2 for charging. When you insert your USB-C power adapter into your Mac Laptop with a USB-C port you will hear a charging chime that verifies your Mac Laptop is charging. Older Mac Laptops without USB-C do not have this function. You can enable this charging chime with this simple terminal command.
PS: The charging chime on the newer Mac Laptops is the exact same chime used on iPhones and iPads to verify charging on those devices too.