there are the following types;
the following is taken from McMaster website.
Thread-forming screws have a blunt point and fine threads. They form mating threads in metal, plastic, and plywood by displacing material rather than cutting it. They form a defined number of threads per inch and require a drilled or punched hole.
Thread-cutting screws cut machine screw threads and eject the chips as they're turned. They have a round shank, tapered entering threads, and a notched end with a blunt tip. Use them in metal, plastic, and plywood. They require a drilled or punched hole.
Self-drilling screws drill their own hole, tap a thread, and fasten material in a single operation. Excellent for use in sheet metal. Install them with a power driver.
McMaster.com has a huge selection of countless types in inch and metric.