The part number CAP CER 0.1UF 25V X5R 0508 refers to a specific ceramic capacitor with the following characteristics: it has a capacitance of 0.1 microfarads, operates at a voltage rating of 25 volts, and is classified as an X5R type ceramic capacitor with a metric size designation of 0508 (or 1220 in imperial measurements). The device also features a tolerance of ±10% for its capacitance value.