There are so many ways to supplement your class these days with technology, from educational applications, to podcasts, to great websites and YouTube channels. Being a History teacher I found many great websites and YouTube channels I could utilize in the classroom. By far my favorite is the YouTube channel called Crash Course History. I absolutely love this channel, and the way they introduce content and do it in a very interesting way that gains the audiences attention and quickly introduces, supports, and summarizes the topic.
I would use these quick videos at the start of a unit for my students to watch. It a great efficient way to provide background, and a quick overview before the lesson. It is also a great conversation started and a way to check for prior knowledge of the students and get them engaged.