Conjecture is an inference or conclusion drawn from incomplete evidence, often through use of presumption or guesswork. Conjecture is an important feature of language, as it allows people to make assumptions about situations without knowing all the facts. This is particularly important in scientific fields, since the hypotheses of most scientific studies involve some degree of conjecture. For example, in the field of linguistics, conjecture is often used by researchers who attempt to study ancient languages. Since it can be difficult to determine how extinct languages operate, researchers often have to use conjecture to make assumptions based on what they know about other languages.