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Great question! Let's refer to a law dictionary.
From Wex, Cornell Legal Information Law Institute's community-built, freely available legal dictionary:
Criminal law, as distinguished from civil law, is a system of laws concerned with crimes and the punishment of individuals who commit crimes. Thus, where in a civil case two parties dispute their rights, a criminal prosecution involves the government deciding whether to punish an individual for either an act or an omission.
A “crime” is any act or omission in violation of a law prohibiting said action or omission.
Make use of Mass.gov to learn more about criminal law in the Commonwealth. Their Criminal Law page breaks the topic down into three categories:
The Massachusetts Trial Court Law Library website has done the research legwork on criminal law and has a page entitled "Massachusetts law about criminal law and procedure" which contains laws, cases, and web sources on criminal law and procedure law.
The Trial Court Law Library also has a Massachusetts Guide to Evidence. It is prepared annually by the Supreme Judicial Court of Massachusetts. The guide arranges the current law in one easily usable document, along the lines of the Federal Rules of Evidence. The Guide presents evidence law as it currently exists, along with explanatory notes.