![](https://i0.wp.com/www.exploringarduino.com/wp-content/uploads/2019/07/0.1uF-Ceramic-Capacitor.jpg?resize=350%2C263&ssl=1)
Image courtesy of Adafruit
A capacitor is a device that stores electrical energy in an electric field. Ceramic capacitors like this one are not polarized, and are often used for creating filter circuits.
Buy a 0.1uF Ceramic Capacitor from Amazon, Pololu, Adafruit, or SparkFun.