Conclusion

Visual aid are an important part of presentations, which emphasize and clarify main points, and improving the look and appearance of presentations and  make them more interesting and eye catching .they helps to get the attention of audience and make the presentation  interesting for the listeners.but on the other side they also have some disadvantages .,like some of the options from them are expensive , so everyone cannot afford it , some are hard , other are difficult to handle. so as we all knows that "coin has two side  head and tale" similarly AV also have some pros and cons .