A more thorough explanation:

A memorandum of points and authorities is a legal document that a party files with a court to support their motion. It is usually required whenever a party files a motion. The memorandum should include:

• A statement of facts
• An introduction of evidence and arguments
• A discussion of relevant case law, statutes, or other secondary materials
• A conclusion and signature block

For example, if a party is filing a motion to dismiss a case, they would file a memorandum of points and authorities to support their argument for dismissal. The memorandum would include the facts of the case, the legal arguments for dismissal, and any relevant case law or statutes that support their position.

It's important to note that the rules for memorandums of points and authorities can vary depending on the state and court system. In New York state courts, for example, these documents are often called Affidavit/Affirmation in Support. California has its own rules for memorandums of points and authorities.