Memos (sometimes pluralized as memoranda) clearly answer a question and provide a statement of facts, findings, and relevant laws that an attorney will present. Questions can be almost anything, but they tend to be common legal issues such as whether a party to a lawsuit bears responsibility or should pay damages.
A memo is distinct from a legal brief. Memos summarize one side’s interpretation of the key facts, laws, and issues at hand, and they state answers plainly. Briefs are more explicitly persuasive and use legal analysis, reasoning, and rhetoric in addition to facts and laws, to show why a given position is correct and what legal principles should apply.