Never make assumptions about your audience what audience knows. If you are not sure, it is better to start at a lower technical level. Regardless of the type of audience, waste no time in making a quick, clear, and simple connection. Find something in common with your listeners and lead with it. The all-important link with the audience can often be established with humor.
Many speakers use humor by telling a joke or anecdote.
But this technique is not as simple as it may seem. Unless you've tried the joke or anecdote before with a similar audience and know it will trigger laughs, caution is the byword. Test the story out with a few friends or colleagues. Ask them to be particularly frank with you in assessing its impact. Your presentation will be remembered by the knowledge it imparts, and not by the jokes it contains.