The document discusses digital pens, which allow handwritten notes to be converted to digital form. A digital pen functions similarly to a regular pen but contains additional components like an optical reader, wireless transmitter, and battery. It records handwriting as coordinates and transmits the data to a computer via Bluetooth. Digital pens offer advantages like the ability to organize and back up notes digitally. They can also record audio and download apps. In conclusion, digital pens provide a cost-effective way to integrate handwriting with digital tools and workflows.