For instance, let's say you're a React developer. Designers set their layers as exportable in SVG, and Specify can automatically export the SVG string, optimize it with SVGO, set the end filename, and generate a JSX component for React - automatically. Here's a short video that should help you understand the whole process (https://youtu.be/Z7fX0v3KFmY?t=353).
You basically just have to configure Specify once, and every time designers update icons in Figma you'll get automated pull requests with icons transformed exactly how you want.