explainer

noun

1. (agent, form-of)Agent noun of explain; one who explains.

   “To be a skilled explainer, one has also to take account of the explainees, and their social and cultural backgrounds, motivations, linguistic ability, and previous knowledge – and plan accordingly before embarking upon the explanation.”

2. A guide that explains a topic.

   “Confused by the Olympics? Here's a video explainer.”

   “In a series of short explainers, the BBC News Channel’s Outside Source presenter has repeatedly skewered the Boris Johnson administration, while never coming within striking distance of seeming to have an opinion.”

   “Quick explainers and infographics giving context to what was happening in Palestine were being shared all over Instagram and TikTok.”