Icebreakers are discussion questions or activities used at the beginning of a lesson or meeting to help participants relax and ease into the session. The document lists 10 different digital icebreakers that can be included in lesson plans, such as using crowd-sourced online stories, an "I Spy" game with geometrical shapes, cloud stories, identifying different animals and their sounds, a museum tour website, a scavenger hunt on first aid, sketching different types of lines, and sharing information about classmates. The purpose of icebreakers is to help students relax, introduce the topic, create a comfortable learning environment, increase motivation, and build connections between participants.