Zoomit is a free utility tool developed by Microsoft that allows you to zoom in and out of your screen, draw on it, and even has a break timer. It's really useful for presentations, as you can use it to highlight important information on the screen. To install it, you can download it from the Microsoft website, it's a pretty small file so it won't take long. Once you've installed it, you can use it by holding down the windows key and the 'z' key at the same time, this will open up the zoomit menu. From there you can choose to zoom in or out, or draw on the screen using your mouse. You can also set a break timer, which can be useful if you're doing a long presentation and want to give your audience a break. It's really easy to use and can be a great addition to your presentations.