Effects processors are devices or software used to modify audio signals in various ways. They can add effects like reverb, delay, distortion, and modulation to enhance the sound of musical instruments or vocals. These processors are commonly used in recording studios and live performances to create unique soundscapes. There are two main types of effects processors: hardware and software. Hardware processors are physical units that connect to audio equipment, while software processors run on computers or digital audio workstations (DAWs). Both types allow musicians and sound engineers to shape and manipulate sound creatively.