This chapter will help you to understand the concept of waves and their various waves. This chapter will be of great help to you in the study of the concept of wavelength and longwave, Transmission of Relationships in the Progressive Wave, Wavelength and Angular Wave Number, Amplitude and Phase, Period, Angular Frequency and Frequency, Speed of a Transverse Wave on Stretched String, The Speed of the Moving Waves, The Speed of the Long Wave (Sound Speed), the System of the Raising Wave, the Display of Waves, and much more.