Disadvantages of not knowing how to keep and gain audience attention can include:

•             The audience will get bored

•             people will become disinterested and may get up and leave in certain situations

•             it could be due to the fact that the speakers presentation was not very well prepared and planned  out

•             Sooner or later, throughout the presentation, it may begin to seem like a waste of time

•             Because your audience is not paying attention to what the speaker's topic is about, there is the possibility that they may miss you on key information that the speaker may have to offer.

Advantages of knowing how to keep and gain audience attention:

• Your audience will be come and stay interested in you and your topic
• Knowing that they are listening to what you have to say, they are receiving key points of information that they'll remember later 
• Gives the speaker the ability to get their message across to their audience more effectively

•       4.   Also lets the speaker know that they prepared an effective and strategic                                                        presentation

Techniques for gaining and keeping attention of audience like self interest and Visuals

                                           Self Interest

 Reviewing your entire presentation to ensure that it meets the critical audience test. Understanding and reviewing your topic will help one understand and organize what they are talking about it. 

                                              Visuals

Give your audience something to look at besides yourself. When you are speaking, and you have visuals then you have an item to refer to as well as your topic.

Techniques like Demonstration and Gimmicks

                                       Demonstration

Include a member of the audience in a demonstration. 

                           Gimmicks

      If you are promoting a product, consider using items to toss out to the audience or to award as prizes to volunteer participants. You can also pass around product samples or promotional literature. Be careful, thought, to maintain control.

Questioning

          Questioning 

     A WISE MAN ONCE SAID…..

“THE KEY TO EFFECTIVE LEARNING IS A TEACHER WITH EXCELLENT AND EFFECTIVE QUESTIONING TECHNIQUES”

 A anchor should always ask questions in the middle of the presentation so as to help the spectators stay active and due to this they can also test themselves whether they agreed the presented material or not. Questioning inquiries also give rise to many ideas from the audience that could be beneficial for the cause upon which the presentation is based. Keep listeners active and involved with rhetorical questions. Ask for a show of hands to get each listener thinking. The response will also give you a quick era of audience attention. 

This video tells us how questioning is helpful for us in all type study using virtual clickers.

Movement

                                               Movement

Walk around the conference table or between the stands. Try to move toward your audience, especially at the beginning and end of your talk. Leave the lecture area whenever possible. Try moving towards your audience, using deliberate movement such as walking to your left and right as transitions between key points within your lecture is also very effective in getting the audience to "follow" you.                        

Drama

                                                    Drama

By taking up the excitement and energy up a score or two, and sprinkling in a little drama, you can give your audience a presentation experience they’ll never forget ,Here are some great ways to breathe life into your presentation.

Tell a Story

Tell a story to the audience about your personal experiences and personal life which helps         them to get emotionally attached to you

             Bigger, Bolder, Louder

Always speak heavy words with full of confidence and in the high pitch of your voice which gives a perfect impression of your personality.

 Act It Out

Explain your things by using acting skills which helps audience to understand your matter easily.

It Is All About the Showmanship

When you are delivering a dramatic presentation, keep in mind that you are the host, the ringmaster, the emcee.  It’s up to you to set the tone, and to make your presentation as entertaining as possible

Put Yourself in the Audience’s Shoes

Go through your presentation  section by section, review and analyze it carefully