As an adjective, Forensic is described by the Merriam-Webster dictionary as, relating to the use of scientific knowledge or methods in solving crimes or relating to, used in, or suitable to a court of law. The term forensic refers to the application of scientific knowledge to legal problems, especially scientific analysis of physical evidence (as from a crime scene). Forensics, generally speaking, is scientific knowledge meant to be applied in court.
However, forensics is not just important in the courtroom; forensic evidence needs to be found before any scientific discussion in court can take place. This evidence is found by forensic scientists by performing certain jobs in fields such as chemistry, biology, psychology and even mathematics.