Flow to HDL is a way to write computer code. It is like giving instructions to a computer, so that it can do the tasks that you want it to do. It is written in a language called HDL (hardware description language). Flow to HDL takes a flow chart (a chart which shows the steps of a process) and turns it into computer code which can be used by a computer to complete the task. Flow to HDL is used in a lot of places, such as robotics and computer engineering.