A vending machine implementation on FPGA with HDL (Hardware Description Language) involves using an FPGA (Field Programmable Gate Array) chip to create the logic circuits and controls for a vending machine. HDL is a programming language that allows the designer to describe the behavior of digital circuits at a high level. The vending machine's functionality can be programmed using HDL and then loaded onto the FPGA chip. The FPGA chip will then be able to control the vending machine's sensors, displays, motors, and other components. The advantages of using FPGA with HDL for vending machines include flexibility, high performance, low power consumption, and ease of design.