What are the primary differences between an F-15 and an F-16?

There are two primary differences between these two aircraft. Visibly the F-15 is a multiengine fighter utilize side by side engines for propulsion. The F-16 only has a single engine. Secondly, their role. F-16's are true air to air combat airplanes created with high mobility for dog fighting or air to air combat. F-15's are designed more on a multi role platform for uses in air to air, and air to ground attack. Less agile, yet far smore sturdy the F-15 is a more reliable attack variant.