What is diffraction

https://staudio.co.uk/wp-content/uploads/2016/03/Horizontal-Vertical-Planes-Of-Sound-Propagation-1024x648.png https://staudio.co.uk/wp-content/uploads/2016/03/Y7-Isobar-1024x668.png https://staudio.co.uk/wp-content/uploads/2016/03/On-Axis-4-copy.jpg https://staudio.co.uk/wp-content/uploads/2016/03/On-Axis-1024x736.png https://staudio.co.uk/wp-content/uploads/2016/03/Diffraction-Stark-1024x350.png https://staudio.co.uk/wp-content/uploads/2016/03/Graphic-EQ--1024x228.png