Sparks are Packback's version of upvotes or likes on social media platforms. A Spark let's the author of a question (post) or reply know that something they said sparked your curiosity. If you read something from a student or peer that inspired, impressed, or sparked your curiosity go ahead and give them a spark to show your appreciation. Each week students receive a limited number of Sparks. Instructors do not have a Spark limit.