Circular saw blades differ in diameter, the material they're made of, how many teeth they have and how big the teeth are. Different combinations make each blade ideal for a certain type of job, such as how to cut laminate countertop. For example, some circular saw blades have diamond-tipped teeth so they can easily slice through hard materials such as ceramic and glass.
Laminates are essentially layers of paper tightly pressed together and glued with a resin. To cut through laminate countertops, you can use a hand saw, but a circular saw makes the job much quicker.