Mid-infrared!
Webb sees in near-infrared and mid-infrared wavelengths — invisible light that we feel as heat. This allows the telescope to peer back in time at the early universe, look through dust clouds to see stars being born, and more: https://spaceplace.nasa.gov/james-webb-space-telescope/en/
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What Is the James Webb Space Telescope? | NASA Space Place – NASA Science for Kids
The James Webb Space Telescope is the largest, most powerful space telescope ever built.spaceplace.nasa.gov