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A preamp, or preamplifier, is an electronic device that amplifies a low-level electrical audio signal to a level that can be recorded or broadcast through a loudspeaker. Many interfaces already have built-in preamps, so you might not need an additional preamp. However, if you find that the built-in preamps of your interface are not satisfactory, or if you want to expand the number of mic inputs, an external preamp could be a useful addition to your setup.

The need for a preamp, therefore, depends on the specific requirements of your recording setup and the features of your interface. It is recommended to check the specifications of your interface and understand its preamp capabilities before deciding on an external preamp.