E-ink, short for electronic ink, refers to a type of electronic paper display technology that mimics the appearance of ink on paper. It is commonly used in e-readers, electronic shelf labels, and other portable electronic devices. E-ink displays are known for their low power consumption, excellent readability in various lighting conditions, and ability to maintain an image without using power once it's been set. This technology is particularly well-suited for applications where a paper-like display with minimal power usage is desirable.