https://www.youtube.com/watch?v=f0gMdGrVteI
Two good introduction videos.
Also, "affecting almost nothing else" is only true if nobody buys the chips the TSMC and Samsung make with their EUV plants. It's probably more the opposite where almost everyone who buys any sort of product with Samsung and/or TSMC chips in it (ie, pretty close to everyone) will be affected.
– DUV: Deep ultraviolet, a wavelength range in the far ultraviolet. Chip production uses 248 and 193 nanometres.
– EUV: Extreme ultraviolet, the wavelength range between roughly 100 and 10 nanometres. In chip manufacture, used as an abbreviation for EUV lithography (also abbreviated EUVL), that is, lithography with light at a wavelength of 13.5 nanometres. EUV is expected to be used in production before 2020.