The Direct Method is similar to broiling. Food is cooked directly over the heat source. For even cooking, food should be turned once halfway through the grilling time. Use the Direct method for foods that take less than 25 minutes to cook: like steaks, chops, kabobs, sausages and vegetables. Direct cooking is also necessary to sear meats. Searing creates that wonderful crisp, caramelized texture where the food hits the grate. It also adds nice grill marks and flavour to the entire food surface. Steaks, chops, chicken pieces, and larger cuts of meat all benefit from searing.
The Indirect Method is similar to roasting, but with the added benefits of that grilled texture, flavour, and appearance you can't get from an oven. Heat rises, reflects off the lid and inside surfaces of the grill, and slowly cooks the food evenly on all sides. The circulating heat works much like a convection oven, so there's no need to turn the food. Use the Indirect Method for foods that require 25 minutes or more of grilling time or for foods that are so delicate that direct exposure to the heat source would dry them out or scorch them.