Poll Everywhere is a web-based tool which easily builds into powerpoint presentations to allow students to respond from their mobile devices. It presents the results in real time, allowing for evaluation of knowledge, or as a prompt for discussion.
Here is a short video which demonstrates it’s use.
Using Polleverywhere is relatively simple and can definitely liven up a presentation. It also allows individuals who rarely speak in class to contribute in a low threat environment. Using this type of tool makes the discussion more relevant and students experience a greater sense of understanding the material
The video above describes the process pretty clearly, but here is an article which also goes into detail about how to use Poll Everywhere: