Light fighters are fighter aircraft towards the low end of the practical range of weight, cost, and complexity over which fighters are fielded. The term lightweight fighter is more commonly used in the modern literature, and by example tends to imply somewhat more capable aircraft than light fighters at the lower practical ranges, but the terms overlap and are sometimes used interchangeably.[lower-alpha 1][lower-alpha 2] Whatever term is used, the concept is to be on the generally lower half of the practical range, but still with carefully selected competitive features, in order to project highly effective force per unit of budget via an efficient design.[1][lower-alpha 3]