A short-range ballistic missile (SRBM) is a ballistic missile with a range of 300 km (190 mi) to 1,000 km (620 mi). In past and potential regional conflicts, these missiles have been and would be used because of the short distances between some countries and their relative low cost and ease of configuration. In modern terminology, SRBMs are part of the wider grouping of theatre ballistic missiles, which includes any ballistic missile with a range of less than 3,500 km.