Halstead complexity measures are a way of measuring how complex a computer program is. The measures look at the number of different things in the program, like the number of different commands or the number of different variables. It also looks at how often those things are used. By looking at all of these things, we can get an idea of how complex the program is. The more complex the program is, the harder it is to read and understand. This can be useful for a programmer because it can help them figure out how to make their code easier to read and understand.