What is the main difference between a pine tree and a scrub pine?

Pine trees are types of coniferous trees, meaning their seeds are produced on a cone (think of a pinecone). Pine trees are the most common coniferous tree in the world, having many different subspecies. Pine trees are typically sun-loving trees, tending to have stunted growth and poor health in shady environments.
There is a specific pine tree called a Virginia pine that, depending on its location and growth style, can also be called a scrub pine. The main difference between the scrub pine and a regular Virginia pine is the growth habit—the scrub pine tends to be short and squat (like a shrub) and often scraggly looking. This is typically due to the plant growing in sterile soils, such as in Ohio.