Zucchini is a firm cylindrical summer squash with glossy dark green skin and pale flesh. It cooks quickly and absorbs flavors, making it ideal for sautés, stir-fries, grilling, baking into breads, or slicing raw for salads. Choose firm, unblemished squash with bright skin; refrigerate and use within a week for best texture and flavor. Works well as a low-carb pasta alternative when spiralized.