Final answer:
The purpose of an informative speech is to provide knowledge, which can include a variety of topics except for convincing listeners to change their behavior, which is the goal of a persuasive speech.
Step-by-step explanation:
The purpose of an informative speech is to share knowledge and information with an audience. It can include teaching listeners how to do something, correcting misconceptions, making listeners aware of a problem, or describing a new procedure or policy.
However, the option 'to convince listeners to stop doing something they are currently doing' falls outside of the informative scope and leans more towards a persuasive speech, where the intent is to influence behaviors, beliefs, or values.