Electronic paper (or e-paper) is a collective name for display technologies that offer paper-like performance - high display clarity and sunlight readability, and all that with very low power consumption (usually ePaper displays do not require any power while the image is not changing).
ePaper displays are found in many devices, and most people will associate ePaper displays with e-readers such as Amazon's Kindle. electronic readers are also available from many other vendors.
Kobo's new flagship e-reader, the Sage, features a 8" 1440x1920 E Ink Carta 1200 display, adaptive ComfortLight Pro frontlight. The Sage, which sports 32GB of storage and a 1.8 Ghz quadcore chipset, can be used to take notes with a stylus (sold separately).
The Sage will ship by the end of October 2021, for $260.
The all-new Amazon Kindle Paperwhite (2021 edition 11th Generation) features a 6.8" 300 PPI E Ink display with front-light, IPX8 water resistance, USB-C charging and 8GB of storage. Amazon also offers the Kindle Paperwhite Signature which has 32 GB of storage, adaptive front-light and wireless charging.
Amazon's Kindle Kids Edition is a standard Kindle device tailored for kids. It features a 6" 167 PPI E Ink display with front lighting. The device comes with one year of unlimited FreeTime (which includes a subscription for thousands of popular titles), a 2-year guarantee and a colorful case.
Amazon's 2019 edition (3rd-Gen) of its flagship e-reader, the Kindle Oasis adds an adjustable front-light light temperature (or warmth as Amazon calls it). The Oasis offers a 7" 300 PPI E Ink display, 8/32 GB of storage, 12 LEDs front light and comes in either Graphite or Champagne Gold colors.