eReaders are dedicated devices specifically designed for reading eBooks, whereas tablets and smartphones are multi-purpose devices with various functionalities. While tablets and smartphones offer versatility and the ability to install multiple apps, eReaders provide a focused reading experience with features tailored to enhance reading, such as e-ink displays that mimic the look of real paper, adjustable lighting for optimal reading conditions, and long battery life dedicated to reading sessions. Additionally, eReaders often have features like note-taking, highlighting, and seamless integration with eBook platforms.