Delving into details: "investigation" vs. "research"

What is similar?

Both "investigation" and "research" involve a systematic process of inquiry and examination to discover facts or gain information.

What is different?

An "investigation" is usually a formal inquiry into a specific event, situation, or crime, often aimed at finding evidence or answering specific questions. It implies a narrower focus and is often associated with legal or official contexts. "Research", on the other hand, is a broader term that refers to the systematic study of a topic or phenomenon to establish facts, reach new conclusions, or develop theories. It is often used in academic or scientific contexts and implies a more general pursuit of knowledge.

Which one is more common?