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Receivers and amplifiers are two different types of electronics devices that are often used together in audio systems.

1. Receivers: A receiver is a unit that contains an amplifier, a tuner, and other inputs for different audio sources. It is typically used in home theater systems to receive signals from various sources like DVD players, Blu-Ray players, streaming devices, and gaming consoles, and then amplify the audio signal to drive a set of speakers.

2. Amplifiers: An amplifier, on the other hand, is a separate device that is used to increase the power of an electrical signal. It is often used in audio systems to amplify the signal from a source like a phone, computer, or even a receiver, so that it can drive a set of speakers at a louder volume.

So, while both receivers and amplifiers can be used to increase the volume of an audio signal, they are different