Signal generators are available in different types, each with different applications and purposes. They also have different designs and use different circuits, offering various levels of capability and functionality. As a result, no single signal generator is suited for all purposes. Examples of signal generators include:

• Function generators — Capable of generating simple repetitive waveforms
• Radio signal generators — Used to generate radio frequency signals
• Vector signal generators — A special type of radio signal generator that generates radio frequency signals with complex modulation formats
• Audio signal generators — Used in audio applications and have low levels of harmonic distortion
• Arbitrary waveform generators — Can produce sophisticated waveforms, often specified by the user
• Pulse generators — Create pulses as signal forms

Signal generators are normally used as electronic test equipment, but are also used in artistic applications. As they support a wide range of digital modulation formats, they are often used in modern wireless communication systems and are also used to test digital transmitters and receivers against complex requirements.