Criminalistics
Police detectives and investigators use criminalistics in crime-scene investigations. Criminalistics is “the scientific study and evaluation of physical evidence in the commission of crimes.” Criminalistics plays a vital role in organizing crime scenes, helping victims, ensuring justice, and serving the public.
https://online.vwu.edu/news/news/criminalistics/

Forensics
Forensic science is the application of science to criminal and civil laws, mainly—on the criminal side—during criminal investigation, as governed by the legal standards of admissible evidence and criminal procedure.
Forensic scientists collect, preserve, and analyze scientific evidence during the course of an investigation… In addition to their laboratory role, forensic scientists testify as expert witnesses in both criminal and civil cases and can work for either the prosecution or the defense…
Forensic science is the combination of two different Latin words… forensic, relates to a discussion or examination performed in public. Because trials in the ancient world were typically held in public, it carries a strong judicial connotation… science… is today closely tied to the scientific method, a systematic way of acquiring knowledge. Taken together, then, forensic science can be seen as the use of the scientific methods and processes in crime solving.
https://en.wikipedia.org/wiki/Forensic_science

Forensic investigation
Forensics are the scientific methods used to solve a crime. Forensic investigation is the gathering and analysis of all crime-related physical evidence in order to come to a conclusion about a suspect. Investigators will look at blood, fluid, or fingerprints, residue, hard drives, computers, or other technology to establish how a crime took place. This is a general definition, though, since there are a number of different types of forensics.

Computer investigations are similar to electronic discovery (or e-discovery). These forensic investigations recover data from computers and hard drives to solve a crime or find evidence of misconduct. Computer investigators can uncover things like sale of black market goods, fraud, and sex trafficking. Some common situations that call for computer investigation are divorce, wrongful termination, employee internet abuse, unauthorized disclosure of corporate information, and other illegal internet activity. Forensic computer investigations can find information on cell phones and hard drives including emails, browsing history, downloaded files, and even deleted data. One of the first cases in which computer forensics lead to a conviction involved the messages exchanged in an online chat room.
https://www.pinow.com/investigations/forensic-investigations

Informatique judiciaire
Computer Forensics (l’informatique judiciaire) également connu sous le nom Cyber Forensics (investigation numérique) se réfère à l'analyse de l'information dans les systèmes informatiques ayant pour objectif de trouver des preuves numériques qui peuvent être utilisés dans des procédures judiciaires mais aussi pour découvrir la cause d'un incident. L'investigation numérique est le processus d'extraction des données et des informations des systèmes informatiques afin de s’en servir comme des preuves numériques à des fins civiques ou, dans la plupart des cas, pour prouver et interdire légalement la cybercriminalité.
https://pecb.com/fr/education-and-certification-for-individu...