YourITronics

They’re “digital” because you can control the resistance over its range programmatically, by sending it commands over a 2-Wire (I2C/TWI) serial interface. So, that means that you can hook it up to some microcontroller, like the Arduino, and adjust the resistance in a little program. The DS1803-010, means it has a range of 0-10K Ohms.

DS1803 Digital Potentiometer: [Link]