The book "Floating Breakwater Made of PET Bottles" by Luana Kann Kelch Vieira addresses the innovative use of PET bottles for constructing an environmentally friendly, floating breakwater. It discusses the challenges of wave reduction along coastlines and presents a sustainable solution based on the reuse of plastic waste. By utilizing recycled materials, it not only protects the environment but also creates an effective barrier against the harmful effects of waves. The content of the book includes the design, sizing, and physical model tests conducted to evaluate the efficiency of the breakwater. The aim of the book is to raise awareness of this eco-friendly technology and to inspire the scientific community and interested parties to engage with the topic.