Final answer:
A point of order is an incidental motion used in meetings to address a breach of the rules and must be addressed immediately.
Step-by-step explanation:
A point of order belongs to the class of motions known as incidental motions. Incidental motions are procedural in nature and are concerned with the rules of order and the proper conduct of business within a meeting or legislative procedure. Unlike substantive motions, such as main motions that propose action, a point of order does not propose action but rather calls for enforcement of the existing rules. It can be raised at any time during the proceedings if a member believes that the rules of the assembly have been breached, and it must be addressed immediately before business continues.