A modular synthesizer is a type of electronic instrument that allows musicians to create and manipulate sounds using separate modules. Each module has a specific function, such as generating sound, filtering frequencies, or adding effects. These modules can be connected in various ways using patch cables, giving users the flexibility to design unique soundscapes. Unlike traditional synthesizers, which have a fixed signal path, modular synthesizers offer a customizable experience. This means that users can experiment with different configurations and settings, leading to a wide range of sonic possibilities. Popular modules include oscillators, filters, and sequencers, all of which can be combined to create complex audio textures.