In which kind of communication does a speaker, with little interruption, deliver a message with a specific purpose to an audience of people who are present during the delivery?

public speaking.

Explanation:

In simplest terms, public speaking is the act of presenting information to the audience. The information used in public speaking is purposeful and intended to educate, impact or entertain the audience. The role of the speaker is central in public speaking as he has to read the audience and make sure they don't get bored. It should be noted here that it is a skill that could be improved by practicing.