That texture affects drainage and the availability of nutrients.
For the best harvest, your vegetable garden needs the best soil you can give it. Rich, healthy soil is something you know when you feel it: It's easy to dig and drains well. Pick up a trowel's worth and put it in your hands. Does it feel gritty? Too much sand. Is it powdery? Too much silt. Is it sticky when wet? Too much clay. The combination of these three types, and in which specific proportions, determines the texture of your garden soil. That texture affects drainage and the availability of nutrients.