Quick public speaking tip – Know your audience

And the first tip is to know your audience.
This is what underlies the construction of most of your content. It is the reason to talk about the benefits of a product instead of the features. It is the reason to use language the audience understands.  Look at your technical terms, and any jargon that they may not understand. Use examples, stories, quotes and other support material that has relevance to their lives and their interests. You will keep their attention and their interest. And if your presentation has been advertised in media or in a conference program, the material in that advertising is what drew people to your session, so try to stick to it, or they will disengage very quickly.
So research you audience before you create your presentation if you can. Find out how best to dress, speak and what will meet their needs, or solve their problems and you have the first step to keeping their attention.