The Slice tool, found by clicking the arrow next to the Frame tool on the bottom toolbar and recognizable by its slicing knife-like icon, is designed for specifying screen regions to export.

Upon activating the Slice tool, the cursor changes to a cross, signifying its precision in selecting export areas. To activate it quickly, just press S on your keyboard.

Unlike the Frame tool, which is used for designing and structuring layouts, the Slice tool zeroes in on specific design areas for export. This allows for precise control over which parts of your design are saved as image files, making it a key tool for exporting individual elements without altering the entire design layout.