The term 'echo effect' is often used interchangeably with the term 'REVERB', which is a 6-letter word. Echo effect is a sound effect that occurs when a sound is repeated multiple times, usually with a slight delay between each repetition. It is commonly used in music production to create a sense of depth and space. REVERB is a type of echo effect that is created by reflecting sound off of surfaces such as walls or ceilings. It is often used to simulate the sound of a room or hall.