This lecture explores the success and challenges of plastics, the increase in production over the years, the concept of circular economy, the main families of plastics, recycling processes, and the properties and manufacturing techniques of plastics. It covers topics such as the reasons behind the popularity of plastics, the environmental impact of plastic production, the importance of circular economy, the different types of plastics, recycling codes, mechanical properties, and manufacturing processes like extrusion, injection molding, blow molding, and rotational molding.