In activities which encourage group or partner-centered content, this is ideal. Not to mention, students can sit anywhere in the room and do not have to "face" any particular direction. I've found this to be a particularly attractive feature for primary teachers that have rug or bean bag areas they would like to use for their lesson!
What makes Nearpod "engaging" though?
As I stated before, you can push out content to your students (easy import of PowerPoints/PDF's/image files etc.) or you can browse teacher-created content already on the site. Now comes the fun part: adding interactive content like polls, quizzes, web pages and, my personal favorite, "Draw It!"'s. The teacher console (your view of Nearpod.com) aggregates student answers and drawings in real time, so you can move throughout the room and help trigger happy students who respond too quickly, answer incorrectly without disrupting other student groups. You can also "push out" student answers to the class (text or drawings) anonymously to discuss them.
Lauren Massie's 4th graders in Cedar Mountain Primary School were using this tech tool in a recent math lesson where we sent them empty base ten block models and gave them decimals (ex: 0.43) and asked them to "draw" the visual model using their mouse. They discussed it with their partners and used their mouse (awesome mouse skill practice, by the way) to submit their drawings. Following this, we pushed out a few incorrect drawings first to talk about them before unveiling a correct one. The students loved it. They learned about comparing decimals all while practicing their typing and mouse skills. Not to mention, this facilitated partner discussions, peer learning and allowed Ms. Massie to differentiate her instruction and give one-on-one time where needed.