Inline engines are a type of internal combustion engine where the cylinders are arranged in a straight line. This design allows for a more compact engine layout, making it easier to fit into various vehicle designs. Inline engines are commonly found in many cars and motorcycles, providing a balance of power and efficiency. These engines can have different configurations, such as inline-four or inline-six, depending on the number of cylinders. Inline engines are known for their smooth operation and relatively simple construction, which can lead to lower manufacturing costs and easier maintenance compared to other engine types like V-engines.