A ceramic capacitor with a capacitance of 0.1 microfarads, rated for 25 volts and measuring 2.04 millimeters in diameter by 5.10 millimeters in length. It is an X5R type, indicating high stability and low loss factor across various frequencies. The "±20" notation refers to the tolerance, which means that the actual capacitance may vary within a range of ±20% from the specified value.