A showreel is a short video that presents an individual's best previous creative work, such as videos and photos. A good showreel is kept short to maintain audience interest, includes only high-quality work, and appeals to the target audience. The document discusses how the author created their showreel using Adobe Premiere Pro, including adding clips, removing audio, adding copyright-free music, and incorporating photos, GIFs, and text. Feedback was gathered after early drafts and changes were made, such as removing borders and adding more context. The final showreel was well-received based on additional feedback.