SlideShare is a website that allows users to upload and share PowerPoint presentations. It can be useful for business presentations, sharing photos, and providing reports to coworkers and friends. It is also useful for teaching subjects like English. The document discusses how SlideShare can be used for teaching by adding various elements like images, videos, audio, and text to present lessons in an engaging way. As an example, a lesson on the simple present continuous tense is presented using shapes, pictures and text. SlideShare can be used as a teaching aid during class and also assigned as homework for students to access on their own devices to study course material.