Which of the following are the three main types of forensic evidence?

The three main types of forensic evidence are classified primarily as physical, biological, and digital evidence. Physical evidence refers to any tangible objects that can be collected at a crime scene, such as fingerprints, weapons, or other items that may contribute to the investigation. Biological evidence includes any organic material that can provide forensic insights, such as blood, hair, or other bodily fluids, which can be crucial for DNA analysis. Digital evidence encompasses any data that can be retrieved from electronic devices, such as computers, smartphones, and servers, which can provide insights into criminal behavior, communications, and even location tracking.

The categorization provided in this answer aligns well with how law enforcement and forensic experts prioritize and utilize different types of evidence in investigations. Each of these evidence types plays a critical role in establishing connections between suspects, victims, and the crime itself, enabling a more comprehensive understanding of the events surrounding a case.