Front‐end electronics are one of the most important components in a particle detector system. Their main purpose is to amplify the small detector signal trying to maximize the Signal‐to‐Noise ratio and, sometimes, to perform some basic processing like energy and time measurement, digitization and storage, according to the specific application. After an introduction to some basic noise principles, a general overview of the most common front‐end schemes will be shown together with some examples and future perspectives.